build: remove unused include dir from clang package

depends/packages/native_clang.mk

@@ -16,7 +16,6 @@ endef
 define $(package)_stage_cmds
   mkdir -p $($(package)_staging_prefix_dir)/lib/clang/$($(package)_version)/include && \
   mkdir -p $($(package)_staging_prefix_dir)/bin && \
-  mkdir -p $($(package)_staging_prefix_dir)/include && \
   cp bin/clang $($(package)_staging_prefix_dir)/bin/ && \
   cp -P bin/clang++ $($(package)_staging_prefix_dir)/bin/ && \
   cp bin/dsymutil $($(package)_staging_prefix_dir)/bin/$(host)-dsymutil && \
@@ -24,7 +23,3 @@ define $(package)_stage_cmds
   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/
 endef
-
-define $(package)_postprocess_cmds
-  rmdir include
-endef