ledflasher: Disable RTTI

There is no longer a reliance on RTTI in libbrillo, so disable RTTI
in the rest of Brillo codebase.

With RTTI disabled, we rely on __PRETTY_FUNCTION__ macro to infer some
type names. Unfortunately CLANG and GCC use different decorations for
template types with default parameters (such as std::vector and std::map)
which causes problems.

Since most of Brillo code is compiled with clang, use that for code
that relies on brillo::Any.

BUG: 26292405
Change-Id: I922649add010fd68dab90146894494864f44c02e

src/ledflasher/Android.mk

@@ -37,7 +37,7 @@ LOCAL_SHARED_LIBRARIES := \
 
 LOCAL_C_INCLUDES := external/gtest/include
 LOCAL_CFLAGS := -Wall -Werror -Wno-sign-promo -Wno-error=unused-parameter
-LOCAL_RTTI_FLAG := -frtti
+LOCAL_CLANG := true
 
 include $(BUILD_EXECUTABLE)
 

src/ledservice/Android.mk

@@ -35,6 +35,7 @@ LOCAL_SHARED_LIBRARIES := \
 	libhardware \
 	libutils \
 
+LOCAL_CLANG := true
 LOCAL_C_INCLUDES := external/gtest/include
 LOCAL_CFLAGS := \
         -Wall \
@@ -42,7 +43,6 @@ LOCAL_CFLAGS := \
         -Wno-sign-promo \
         -Wno-missing-field-initializers \
         -Wno-error=unused-parameter
-LOCAL_RTTI_FLAG := -frtti
 
 include $(BUILD_EXECUTABLE)