Merge pull request swiftlang#82154 from phausler/pr/timespec_cast_fixes

static cast the tv_sec for the timespec constructions is the dispatch scheduler

Author: jckarter

stdlib/public/Concurrency/DispatchGlobalExecutor.cpp

@@ -319,9 +319,14 @@ clock_and_value_to_time(int clock, long long sec, long long nsec) {
       .tv_sec = sec,
       .tv_nsec = static_cast<long>(nsec)
     };
+#elif defined(__APPLE__)
+    struct timespec ts = { 
+      .tv_sec = static_cast<__darwin_time_t>(sec),
+      .tv_nsec = nsec
+    };
 #else
     struct timespec ts = { 
-      .tv_sec = sec,
+      .tv_sec = static_cast<long>(sec),
       .tv_nsec = nsec
     };
 #endif