Fixed sys/time.h vs time.h issue on Linux

There was a compilation issue on some bots on Linux related to
time functions which was fixable with a simple config setting.

Change-Id: I8bc71f4298d662e48dd12a4c8963ed5ef3211949
Reviewed-on: https://swiftshader-review.googlesource.com/8252
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>
diff --git a/third_party/LLVM/include-linux/llvm/Config/config.h b/third_party/LLVM/include-linux/llvm/Config/config.h
index 08ae033..509bc26 100644
--- a/third_party/LLVM/include-linux/llvm/Config/config.h
+++ b/third_party/LLVM/include-linux/llvm/Config/config.h
@@ -669,7 +669,7 @@
 #undef STAT_MACROS_BROKEN
 
 /* Define to 1 if you can safely include both <sys/time.h> and <time.h>. */
-#undef TIME_WITH_SYS_TIME
+#define TIME_WITH_SYS_TIME 1
 
 /* Define to 1 if your <sys/time.h> declares `struct tm'. */
 #undef TM_IN_SYS_TIME