android: avoid using libdrm with host modules

Note LOCAL_CFLAGS and LOCAL_SHARED_LIBRARIES in Android.common.mk
are used by both host and target modules. However, commit 112e988
moved libdrm related flags to common. It causes the errors like:

error: 'out/host/linux-x86/obj32/SHARED_LIBRARIES/libdrm_intermediates/export_includes',
needed by 'out/host/linux-x86/obj32/EXECUTABLES/mesa_gen_matypes_intermediates/import_includes',
missing and no known rule to make it

No reason to use libdrm with host modules.

Cc: "13.0" <mesa-stable@lists.freedesktop.org>
Fixes: 112e988329 ("Android: move libdrm settings to top-level
Android.common.mk")
Signed-off-by: Chih-Wei Huang <cwhuang@linux.org.tw>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

Android.common.mk

 	-D__STDC_LIMIT_MACROS
 endif
 
+ifneq ($(LOCAL_IS_HOST_MODULE),true)
 # add libdrm if there are hardware drivers
 ifneq ($(filter-out swrast,$(MESA_GPU_DRIVERS)),)
 LOCAL_CFLAGS += -DHAVE_LIBDRM
 LOCAL_SHARED_LIBRARIES += libdrm
 endif
+endif
 
 LOCAL_CPPFLAGS += \
 	$(if $(filter true,$(MESA_LOLLIPOP_BUILD)),-D_USING_LIBCXX) \