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

This reverts commit 6dae9176d6.

No longer needed as of last commit.

Cc: Rob Herring <robh@kernel.org>

Android.common.mk

@@ -32,7 +32,6 @@ LOCAL_C_INCLUDES += \
 MESA_VERSION := $(shell cat $(MESA_TOP)/VERSION)
 LOCAL_CFLAGS += \
 	-Wno-unused-parameter \
-	-Wno-date-time \
 	-Wno-pointer-arith \
 	-Wno-missing-field-initializers \
 	-Wno-initializer-overrides \