[ros-svn] [royce] 13993: fix some dependencies

[royce at svn.reactos.com]

fix some dependencies
get rid of unnecessary phony targets
eliminate unnecessary makefile.auto dependencies
silence gcc when detecting pch


Updated files:
branches/xmlbuildsystem/reactos/Makefile
branches/xmlbuildsystem/reactos/tools/rbuild/backend/mingw/mingw.cpp
branches/xmlbuildsystem/reactos/tools/rbuild/backend/mingw/modulehandler.cpp
branches/xmlbuildsystem/reactos/tools/rbuild/backend/mingw/modulehandler.h
branches/xmlbuildsystem/reactos/tools/rbuild/rbuild.h