8316532: Native library copying in BuildMicrobenchmark.gmk cause dups on macOS

Reviewed-by: ihse, redestad

Author: erikj79

make/test/BuildMicrobenchmark.gmk

@@ -156,10 +156,10 @@ $(eval $(call SetupTestFilesCompilation, BUILD_MICROBENCHMARK_LIBRARIES, \
 
 # Setup copy of native dependencies to image output dir
 $(eval $(call SetupCopyFiles, COPY_MICROBENCHMARK_NATIVE, \
-    SRC := $(MICROBENCHMARK_NATIVE_OUTPUT), \
+    SRC := $(MICROBENCHMARK_NATIVE_OUTPUT)/lib, \
     DEST := $(MICROBENCHMARK_IMAGE_DIR)/native, \
-    FILES := $(BUILD_MICROBENCHMARK_LIBRARIES), \
-    FLATTEN := true, \
+    FILES := $(filter $(MICROBENCHMARK_NATIVE_OUTPUT)/lib/%, \
+        $(BUILD_MICROBENCHMARK_LIBRARIES)), \
 ))
 
 all: $(MICROBENCHMARK_JAR) $(BUILD_MICROBENCHMARK_LIBRARIES) $(COPY_MICROBENCHMARK_NATIVE)