nacl osx patch by @pr0zac

nacl-osx.patch

--- nacl-20110221/curvecp/nanoseconds.c	2011-02-20 17:49:34.000000000 -0800
+++ NaCl/curvecp/nanoseconds.c	2011-10-01 16:56:43.000000000 -0700
@@ -1,4 +1,8 @@
 #include <time.h>
+#ifdef __MACH__ // OS X does not have clock_gettime, use clock_get_time
+#include <mach/clock.h>
+#include <mach/mach.h>
+#endif
 #include "nanoseconds.h"
 
 /* XXX: Y2036 problems; should upgrade to a 128-bit type for this */
@@ -7,6 +11,17 @@
 long long nanoseconds(void)
 {
   struct timespec t;
+
+#ifdef __MACH__ // OS X does not have clock_gettime, use clock_get_time
+  clock_serv_t cclock;
+  mach_timespec_t mts;
+  host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &cclock);
+  clock_get_time(cclock, &mts);
+  mach_port_deallocate(mach_task_self(), cclock);
+  t.tv_sec = mts.tv_sec;
+  t.tv_nsec = mts.tv_nsec;
+#else
   if (clock_gettime(CLOCK_REALTIME,&t) != 0) return -1;
+#endif
   return t.tv_sec * 1000000000LL + t.tv_nsec;
 }