[compiler-rt][profile] Use flock shim on Windows even if detection fails

This is a follow-up fix for d4efc3e, which
introduced CMake-time feature test for `flock`. The feature test always
fails on Windows, but we still need to use the `flock` shim provided by
WindowsMMap.h regardless of the feature test result.

Author: kateinoigakukun

compiler-rt/lib/profile/InstrProfilingUtil.c

@@ -152,7 +152,8 @@ COMPILER_RT_VISIBILITY int lprofLockFd(int fd) {
     }
   }
   return 0;
-#elif defined(COMPILER_RT_HAS_FLOCK)
+#elif defined(COMPILER_RT_HAS_FLOCK) || defined(_WIN32)
+  // Windows doesn't have flock but WindowsMMap.h provides a shim
   flock(fd, LOCK_EX);
   return 0;
 #else
@@ -179,7 +180,8 @@ COMPILER_RT_VISIBILITY int lprofUnlockFd(int fd) {
     }
   }
   return 0;
-#elif defined(COMPILER_RT_HAS_FLOCK)
+#elif defined(COMPILER_RT_HAS_FLOCK) || defined(_WIN32)
+  // Windows doesn't have flock but WindowsMMap.h provides a shim
   flock(fd, LOCK_UN);
   return 0;
 #else