Disable 'futimens' calls.

It's not available on older versions of macOS.

Bug b/115344057

Change-Id: I220a26812e5d1bc1fd0bacae490a7bdbc6a7e6df
Reviewed-on: https://swiftshader-review.googlesource.com/c/22228
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
diff --git a/third_party/llvm-7.0/configs/darwin/include/llvm/Config/config.h b/third_party/llvm-7.0/configs/darwin/include/llvm/Config/config.h
index 594e68b..2e88669 100644
--- a/third_party/llvm-7.0/configs/darwin/include/llvm/Config/config.h
+++ b/third_party/llvm-7.0/configs/darwin/include/llvm/Config/config.h
@@ -70,8 +70,8 @@
 /* Define to 1 if you have the <ffi.h> header file. */
 /* #undef HAVE_FFI_H */
 
-/* Define to 1 if you have the `futimens' function. */
-#define HAVE_FUTIMENS 1
+/* Define to 1 if you have the `futimens' function. */

+/* #undef HAVE_FUTIMENS */
 
 /* Define to 1 if you have the `futimes' function. */
 #define HAVE_FUTIMES 1