add make CONF=pthread for modern systems

include/lib.h

@@ -121,7 +121,12 @@ extern	char*	utfrrune(char*, long);
 
 typedef struct Lock
 {
+#ifdef PTHREAD
+	int init;
+	pthread_mutex_t mutex;
+#else
 	long	key;
+#endif
 } Lock;
 
 typedef struct QLock

include/unix.h

@@ -1,3 +1,4 @@
+#undef _FORTIFY_SOURCE	/* stupid ubuntu warnings */
 #define __BSD_VISIBLE 1 /* FreeBSD 5.x */
 #define _BSD_SOURCE 1
 #define _NETBSD_SOURCE 1	/* NetBSD */
@@ -24,7 +25,10 @@
 #include <inttypes.h>
 #include <ctype.h>
 #include <errno.h>
+#ifdef PTHREAD
+#include <pthread.h>
+#endif
 
 typedef long long		p9_vlong;
-typedef	unsigned long long p9_uvlong;
+typedef unsigned long long p9_uvlong;
 typedef uintptr_t uintptr;