server: 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>
---
 server/request.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/server/request.c b/server/request.c
index 781889c..6120bc5 100644
--- a/server/request.c
+++ b/server/request.c
@@ -518,7 +518,12 @@ int send_client_fd( struct process *process, int fd, obj_handle_t handle )
 /* get current tick count to return to client */
 unsigned int get_tick_count(void)
 {
-#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 / 1000000;
+#elif defined(HAVE_CLOCK_GETTIME)
     struct timespec ts;
 #ifdef CLOCK_MONOTONIC_RAW
     if (!clock_gettime( CLOCK_MONOTONIC_RAW, &ts ))
@@ -526,11 +531,6 @@ unsigned int get_tick_count(void)
 #endif
     if (!clock_gettime( CLOCK_MONOTONIC, &ts ))
         return ts.tv_sec * 1000 + ts.tv_nsec / 1000000;
-#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 / 1000000;
 #endif
     return (current_time - server_start_time) / 10000;
 }
-- 
2.10.2