Switch rsg-generator-support to use no STL, since it is pure C.

We should really fix rsg-generator to install itself, and then be invoked
from a location with access to libc++.so, but this fixes things for the
time being.

Change-Id: Ia019edf7f984b7e0338c1618f3ee207e0899e03e
diff --git a/v8/renderscript/rs_support/Android.mk b/v8/renderscript/rs_support/Android.mk
index c071b68..3370544 100644
--- a/v8/renderscript/rs_support/Android.mk
+++ b/v8/renderscript/rs_support/Android.mk
@@ -28,6 +28,8 @@
     spec.l \
     rsg_generator.c
 
+LOCAL_CXX_STL := none
+
 include $(BUILD_HOST_EXECUTABLE)
 
 # TODO: This should go into build/core/config.mk