libc: introduce "jehanne_" namespace

With this commit all functions declared in libc.h have been renamed
with the "jehanne_" prefix. This is done for several reason:

- it removes conflicts during symbol resolution when linking
  standard C libraries like newlib or musl
- it allows programs depending on a standard C library to directly
  link to a library depending on our non standard libc (eg libsec).

To ease transiction two files are provided:

- sys/include/lib9.h that can be included instead of <libc.h> to use
  the old names (via a simple set of macros)
- sys/src/lib/c/lib9.c that can be compiled with a program where the
  macro provided by lib9.h are too dumb (see for example rc or grep).

In the kernel port/lib.h has been modified accordingly and some of
the functions it directly provides has been renamed too (eg malloc
in qmalloc.c and print in devcons.c).

qa/kern/alarm.c

@@ -16,7 +16,7 @@
  * along with Jehanne.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 /* Test alarm(2):
  * - alarms replace each other (the last one wins)

qa/kern/args.c

@@ -1,5 +1,5 @@
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 /*
  *	The whole regression test I am after here is to call qa/kern/args with

qa/kern/awake.c

@@ -16,7 +16,7 @@
  * along with Jehanne.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 int verbose = 1;
 

qa/kern/brk.c

@@ -16,7 +16,7 @@
  * along with Jehanne.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 void
 main(void)

qa/kern/execl.c

@@ -1,5 +1,5 @@
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 void
 main(int argc, char *argv[])

qa/kern/float.c

@@ -1,5 +1,5 @@
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 #define DPRECSTR	"0.0000004000000000125"
 #define DPREC	0.0000004000000000125

qa/kern/fork.c

@@ -8,7 +8,7 @@
  */
 
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 void
 main(void)

qa/kern/frexp.c

@@ -1,5 +1,5 @@
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 #define DEEPS	".5*2^-1073"
 #define DENEPS	"-.5*2^-1073"

qa/kern/getmainpid.c

@@ -16,7 +16,7 @@
  * along with Jehanne.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 void
 main(void)

qa/kern/getpid.c

@@ -16,7 +16,7 @@
  * along with Jehanne.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 void
 main(void)

qa/kern/getppid.c

@@ -16,7 +16,7 @@
  * along with Jehanne.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 void
 main(void)

qa/kern/iphash.c

@@ -8,7 +8,7 @@
  */
 
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 #include <ip.h>
 
 /* from the kernel. Sorry. */

qa/kern/malloc1GiB.c

@@ -16,7 +16,7 @@
  * along with Jehanne.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 #define GiB 1024*1024*1024
 

qa/kern/memoryisolation.c

@@ -16,7 +16,7 @@
  * along with Jehanne.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 #define MSGTPL "Hello from %d!"
 

qa/kern/memoryshare.c

@@ -16,7 +16,7 @@
  * along with Jehanne.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 #define MSGTPL "Hello from %d!"
 

qa/kern/mixedfloat.c

@@ -1,5 +1,5 @@
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 #define INT	2
 #define FLOAT	2.5

qa/kern/noexecmem.c

@@ -1,5 +1,5 @@
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 #define RET 0xc3
 
 int success;

qa/kern/notify.c

@@ -1,5 +1,5 @@
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 #define RET 0xc3
 
 void

qa/kern/nsec.c

@@ -1,5 +1,5 @@
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 int verbose = 0;
 void

qa/kern/pipering.c

@@ -1,5 +1,5 @@
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 int nring = 32;
 int niter = 1024;

qa/kern/postnote.c

@@ -16,7 +16,7 @@
  * along with Jehanne.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 int verbose = 0;
 int procNoteReceived;

qa/kern/psx.c

@@ -8,7 +8,7 @@
  */
 
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 void
 main(int argc, char *argv[])

qa/kern/sched0.c

@@ -16,7 +16,7 @@
  * along with Jehanne.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 /* verify that the scheduler give each process a chance to run
  * with a single cpu (x86) this test do not pass on plan9/9front

qa/kern/segattach.c

@@ -16,7 +16,7 @@
  * along with Jehanne.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 int verbose = 1;
 

qa/kern/syscall.c

@@ -1,6 +1,6 @@
 
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 void
 main(void)

qa/kern/sysstatread.c

@@ -1,5 +1,5 @@
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 // Change-Id: I1cfd642d29a3955499b3507f56f0449d1710700e
 // sys/src/nxm/port/devcons.c:

qa/kern/tsemacquire.c

@@ -1,5 +1,5 @@
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 int32_t nprocs = 32;
 int32_t nloops = 10000;

qa/kern/waserror.c

@@ -3,7 +3,7 @@
 // -- complete
 // Since we're going to improve waserror
 #include <u.h>
-#include <libc.h>
+#include <lib9.h>
 
 void
 main(void)