RTL flags aren't host Cflags when you're cross-compiling b=419272 r=ted a=damons

config/config.mk

@@ -597,7 +597,10 @@ COMPILE_CFLAGS	= $(VISIBILITY_FLAGS) $(DEFINES) $(INCLUDES) $(XCFLAGS) $(PROFILE
 COMPILE_CXXFLAGS = $(VISIBILITY_FLAGS) $(DEFINES) $(INCLUDES) $(XCFLAGS) $(PROFILER_CFLAGS) $(DSO_CFLAGS) $(DSO_PIC_CFLAGS)  $(CXXFLAGS) $(RTL_FLAGS) $(OS_COMPILE_CXXFLAGS)
 COMPILE_CMFLAGS = $(OS_COMPILE_CMFLAGS)
 COMPILE_CMMFLAGS = $(OS_COMPILE_CMMFLAGS)
+
+ifndef CROSS_COMPILE
 HOST_CFLAGS += $(RTL_FLAGS)
+endif
 
 #
 # Name of the binary code directories