Use existing my_32_64_bit_suffix.

# This can be disabled with LOCAL_RENDERSCRIPT_FLAGS := -Wno-error

renderscript_flags := -Wall -Werror

renderscript_flags += $(LOCAL_RENDERSCRIPT_FLAGS)

renderscript_flags += -m$(if $($(LOCAL_2ND_ARCH_VAR_PREFIX)$(my_prefix)IS_64_BIT),64,32)

# -m32 or -m64

renderscript_flags += -m$(my_32_64_bit_suffix)

renderscript_includes := \

    $(TOPDIR)external/clang/lib/Headers \