Add miscfuncs.h to files as needed throughout.

* mount.cc: New file.
* path.cc: Move mount-specific stuff into mount.cc.  Move common stuff into
miscfuncs.cc.  Remove unneeded includes.
* miscfuncs.cc: Move some common path functions here.
* miscfuncs.h: New file.
* winsup.h: Move miscelleneous functions to miscfuncs.h.
* dcrt0.cc: Remove unneeded includes.
* Makefile.in (DLL_OFILES): Add mount.o.
* include/cygwin/config.h: Fix a minor typo.

winsup/cygwin/autoload.cc

@@ -9,9 +9,12 @@ Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
 details. */
 
 #include "winsup.h"
+#include "miscfuncs.h"
 #define USE_SYS_TYPES_FD_SET
 #include <winsock2.h>
 
+bool NO_COPY wsock_started;
+
 /* Macro for defining "auto-load" functions.
  * Note that this is self-modifying code *gasp*.
  * The first invocation of a routine will trigger the loading of
@@ -243,7 +246,6 @@ std_dll_init ()
 }
 
 /* Initialization function for winsock stuff. */
-bool NO_COPY wsock_started = 0;
 WSADATA NO_COPY wsadata;
 __attribute__ ((used, noinline, regparm(1))) static long long
 wsock_init ()