[build] remove obsolete clean targets + add fuller distclean ops

Makefile

@@ -95,11 +95,10 @@ lproj: config.gypi linux/llmr-app.gyp clear_xcode_cache node
 clean: clear_xcode_cache
 	-find ./deps/gyp -name "*.pyc" -exec rm {} \;
 	-rm -rf ./build/
-	-rm -f ./include/llmr/shader/shaders.hpp
-	-rm -f ./include/llmr/style/resources.hpp
-	-rm -f ./src/style/resources.cpp
 
 distclean: clean
-	-rm -rf ./build
+	-rm -rf ./config.mk
+	-rm -rf ./config.gypi
+	-rm -rf ./mapnik-packaging/osx/out/
 
 .PHONY: llmr test linux