message: build: remove -f from clang cp invocation
diff: @@ -21,5 +21,5 @@ define $(package)_stage_cmds
  cp bin/dsymutil $($(package)_staging_prefix_dir)/bin/$(host)-dsymutil && \
  cp bin/llvm-config $($(package)_staging_prefix_dir)/bin/ && \
  cp lib/libLTO.so $($(package)_staging_prefix_dir)/lib/ && \
  - cp -rf lib/clang/$($(package)_version)/include/* $($(package)_staging_prefix_dir)/lib/clang/$($(package)_version)/include/
  + cp -r lib/clang/$($(package)_version)/include/* $($(package)_staging_prefix_dir)/lib/clang/$($(package)_version)/include/
  endef
  