cxx_stl_setup is not executed for modules from soong

cxx_stl_setup is adding libunwind_llvm to the dependency even for
modules from soong. However, since this dependency was already handled
in soong, those modules don't need to go through it again.

Bug: 64815735
Test: BOARD_VNDK_VERSION=current mma -j (under /hardware/libhardware)

Change-Id: Id6e2547c752ec831aa56a14c0bf4db0a55d51243
diff --git a/core/binary.mk b/core/binary.mk
index 6d6b6a9..e85a38a 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -53,6 +53,7 @@
 my_cc := $(LOCAL_CC)
 my_cc_wrapper := $(CC_WRAPPER)
 my_cxx := $(LOCAL_CXX)
+my_cxx_ldlibs :=
 my_cxx_wrapper := $(CXX_WRAPPER)
 my_c_includes := $(LOCAL_C_INCLUDES)
 my_generated_sources := $(LOCAL_GENERATED_SOURCES)
@@ -447,7 +448,10 @@
 my_whole_static_libraries := $(LOCAL_WHOLE_STATIC_LIBRARIES_$($(my_prefix)$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH)) $(LOCAL_WHOLE_STATIC_LIBRARIES_$(my_32_64_bit_suffix)) $(my_whole_static_libraries)
 my_header_libraries := $(LOCAL_HEADER_LIBRARIES_$($(my_prefix)$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH)) $(LOCAL_HEADER_LIBRARIES_$(my_32_64_bit_suffix)) $(my_header_libraries)
 
+# soong defined modules already have done through this
+ifneq ($(LOCAL_MODULE_MAKEFILE),$(SOONG_ANDROID_MK))
 include $(BUILD_SYSTEM)/cxx_stl_setup.mk
+endif
 
 # Add static HAL libraries
 ifdef LOCAL_HAL_STATIC_LIBRARIES