libweave: Disable RTTI

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

Bug: 26292405
Change-Id: Ib135ac51a2d8b4c692fd0eaf78a58dc409096310
Reviewed-on: https://weave-review.googlesource.com/2066
Reviewed-by: Vitaly Buka <vitalybuka@google.com>

Android.mk

diff --git a/Android.mk b/Android.mk
index 28bac3c..143fe29 100644
--- a/Android.mk
+++ b/Android.mk
@@ -50,7 +50,6 @@
 LOCAL_C_INCLUDES := $(libweaveCommonCIncludes)
 LOCAL_SHARED_LIBRARIES := $(libweaveSharedLibraries)
 LOCAL_STATIC_LIBRARIES :=
-LOCAL_RTTI_FLAG := -frtti
 LOCAL_CLANG := true
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/external
 
@@ -78,7 +77,6 @@
 LOCAL_C_INCLUDES := $(libweaveCommonCIncludes)
 LOCAL_SHARED_LIBRARIES := $(libweaveSharedLibraries)
 LOCAL_STATIC_LIBRARIES := libweave-external
-LOCAL_RTTI_FLAG := -frtti
 LOCAL_CLANG := true
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)
 
@@ -137,7 +135,6 @@
 LOCAL_SHARED_LIBRARIES := $(libweaveSharedLibraries)
 LOCAL_STATIC_LIBRARIES := libgtest libgmock
 LOCAL_CLANG := true
-LOCAL_RTTI_FLAG := -frtti
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
 
 LOCAL_SRC_FILES := \
@@ -158,7 +155,6 @@
 LOCAL_SHARED_LIBRARIES := $(libweaveSharedLibraries)
 LOCAL_WHOLE_STATIC_LIBRARIES := libweave-common libweave-external
 LOCAL_CLANG := true
-LOCAL_RTTI_FLAG := -frtti
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
 
 LOCAL_SRC_FILES := \