remove unused dirs

mk/build.mk

@@ -169,7 +169,7 @@ endif
 
 ${STAGING_TARGET_DIR} ${STAGING_TARGET_DIR}/etc ${STAGING_HOST_DIR}:
 	mkdir -p ${STAGING_TARGET_DIR}/{bin,etc,lib,usr/bin,usr/include,usr/lib/pkgconfig} \
-		${STAGING_HOST_DIR}/{bin,lib,usr/bin,usr/lib,usr/include}
+		${STAGING_HOST_DIR}/{usr/bin,usr/lib,usr/include}
 	for i in lib64 lib32 libx32;do \
 		cd ${STAGING_TARGET_DIR}/; ln -sf lib $$i; \
 		cd ${STAGING_TARGET_DIR}/usr; ln -sf lib $$i; \