Allow implicit-fallthrough warnings locally.

It will be a global error by default.

Test: make checkbuild
Bug: 112564944
Change-Id: If026764b991851c81c4f01c025de43240e0f63f5
Exempt-From-Owner-Approval: do not block on new warnings
diff --git a/Android.mk b/Android.mk
index d5ee200..a2fe0ef 100644
--- a/Android.mk
+++ b/Android.mk
@@ -77,6 +77,9 @@
 
 LOCAL_CFLAGS := $(common_drm_hwcomposer_cflags)
 
+# Suppress warnings until they are fixed in drmhwctwo.cpp
+LOCAL_CFLAGS += -Wno-error=implicit-fallthrough
+
 LOCAL_CPPFLAGS += \
 	-DHWC2_USE_CPP11 \
 	-DHWC2_INCLUDE_STRINGIFICATION