contrib: http_parser: create lib directory if it doesn't exist yet at this point

Change-Id: If1a026fd7ad474129a95c3fb4434cd0b3b598be5

contrib/src/http_parser/rules.mak

@@ -21,5 +21,6 @@ http_parser: http-parser-$(HTTP_PARSER_VERSION).tar.gz
 
 .http_parser: http_parser toolchain.cmake .sum-http_parser
 	cd $< && $(HOSTVARS) $(MAKE) $(HTTP_PARSER_MAKECONF) package
+	mkdir -p $(PREFIX)/lib
 	cd $< && cp -f http_parser.h $(PREFIX)/include && cp -f libhttp_parser.a $(PREFIX)/lib
 	touch $@