Android: add -Wno-date-time flag for clang

clang complains about date/time macros:

src/mesa/main/context.c:403:25: error: expansion of date or time macro is not reproducible [-Werror,-Wdate-time]

Disable this warning.

Cc: "11.1 11.2" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
diff --git a/Android.common.mk b/Android.common.mk
index c4823f7..7ca989c 100644
--- a/Android.common.mk
+++ b/Android.common.mk
@@ -33,6 +33,7 @@
 # define ANDROID_VERSION (e.g., 4.0.x => 0x0400)
 LOCAL_CFLAGS += \
 	-Wno-unused-parameter \
+	-Wno-date-time \
 	-DPACKAGE_VERSION=\"$(MESA_VERSION)\" \
 	-DPACKAGE_BUGREPORT=\"https://bugs.freedesktop.org/enter_bug.cgi?product=Mesa\" \
 	-DANDROID_VERSION=0x0$(MESA_ANDROID_MAJOR_VERSION)0$(MESA_ANDROID_MINOR_VERSION)