Time::HiRes: fix Darwins with clock_gettime

Not all of the Darwin time code was guarded by the same set of #ifdefs,
leading to bugs on Darwin platforms with clock_gettime where a struct
would not be defined but would still be used elsewhere.

Author: mistydemeo

dist/Time-HiRes/HiRes.pm

@@ -28,7 +28,7 @@ our @EXPORT_OK = qw (usleep sleep ualarm alarm gettimeofday time tv_interval
 		 stat lstat
 		);
 
-our $VERSION = '1.9733';
+our $VERSION = '1.9734';
 our $XS_VERSION = $VERSION;
 $VERSION = eval $VERSION;
 

dist/Time-HiRes/HiRes.xs

@@ -940,7 +940,7 @@ BOOT:
   }
 #   endif
 #endif
-#if defined(PERL_DARWIN)
+#if defined(PERL_DARWIN) && !defined(CLOCK_REALTIME)
 #  ifdef USE_ITHREADS
   MUTEX_INIT(&darwin_time_mutex);
 #  endif