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build: do not error out if clock_gettime is not found on darwin

Also prefer clock_gettime over mach_absolute_time on darwin.
clock_gettime is only available in darwin 10.12 and later.

Hopefully fixes #283.

--- a/meson.build

+++ b/meson.build

@@ -122,7 +122,7 @@

     rt_dependency = []

     if cc.has_function('clock_gettime', prefix : '#include <time.h>', args : test_args)

         cdata.set('HAVE_CLOCK_GETTIME', 1)

-    else

+    elif host_machine.system() != 'darwin'

         rt_dependency = cc.find_library('rt', required: false)

         if not cc.has_function('clock_gettime', prefix : '#include <time.h>', args : test_args, dependencies : rt_dependency)

             error('clock_gettime not found')

--- a/tools/dav1d.c

+++ b/tools/dav1d.c

@@ -64,14 +64,14 @@

     LARGE_INTEGER t;

     QueryPerformanceCounter(&t);

     return 1000000000 * t.QuadPart / frequency.QuadPart;

-#elif defined(__APPLE__)

-    mach_timebase_info_data_t info;

-    mach_timebase_info(&info);

-    return mach_absolute_time() * info.numer / info.denom;

 #elif defined(HAVE_CLOCK_GETTIME)

     struct timespec ts;

     clock_gettime(CLOCK_MONOTONIC, &ts);

     return 1000000000ULL * ts.tv_sec + ts.tv_nsec;

+#elif defined(__APPLE__)

+    mach_timebase_info_data_t info;

+    mach_timebase_info(&info);

+    return mach_absolute_time() * info.numer / info.denom;

 #endif

 }