libgui: Fix some bitrot/warnings in tests
These tests hadn't been run in a while and had accumulated some rot.
This fixes most of the compile warnings and some tests which fail
incorrectly, but 2 failures remain on N6.
Change-Id: I7fee78cd058a32f4d7df40ec9f899ff767f68517
diff --git a/libs/gui/tests/Android.mk b/libs/gui/tests/Android.mk
index 128a32a..6ad9986 100644
--- a/libs/gui/tests/Android.mk
+++ b/libs/gui/tests/Android.mk
@@ -3,6 +3,8 @@
include $(CLEAR_VARS)
LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
+LOCAL_CLANG := true
+
LOCAL_MODULE := libgui_test
LOCAL_MODULE_TAGS := tests