ntdll: On macOS, don't use clock_gettime() even if it's available.

[Ken Thomases]

The problem is building against the 10.12 or later SDK but deploying to 10.11
or earlier.  Support for clock_gettime() is new with 10.12 so configure finds
it and the code uses it, but the symbol is weak linked and resolves to NULL
when running on earlier versions.

Signed-off-by: Ken Thomases <ken at codeweavers.com>
---
 dlls/ntdll/time.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/dlls/ntdll/time.c b/dlls/ntdll/time.c
index 3ba3c68..12dbdc3 100644
--- a/dlls/ntdll/time.c
+++ b/dlls/ntdll/time.c
@@ -101,7 +101,12 @@ static ULONGLONG monotonic_counter(void)
 {
     struct timeval now;
 
-#ifdef HAVE_CLOCK_GETTIME
+#ifdef __APPLE__
+    static mach_timebase_info_data_t timebase;
+
+    if (!timebase.denom) mach_timebase_info( &timebase );
+    return mach_absolute_time() * timebase.numer / timebase.denom / 100;
+#elif defined(HAVE_CLOCK_GETTIME)
     struct timespec ts;
 #ifdef CLOCK_MONOTONIC_RAW
     if (!clock_gettime( CLOCK_MONOTONIC_RAW, &ts ))
@@ -109,11 +114,6 @@ static ULONGLONG monotonic_counter(void)
 #endif
     if (!clock_gettime( CLOCK_MONOTONIC, &ts ))
         return ts.tv_sec * (ULONGLONG)TICKSPERSEC + ts.tv_nsec / 100;
-#elif defined(__APPLE__)
-    static mach_timebase_info_data_t timebase;
-
-    if (!timebase.denom) mach_timebase_info( &timebase );
-    return mach_absolute_time() * timebase.numer / timebase.denom / 100;
 #endif
 
     gettimeofday( &now, 0 );
-- 
2.10.2