* MinGWResourceCompiler: change output directory and name of compiled resource file (old resource object files have to be deleted manually, eg. cvpcb/cvpcb_rc.o since the 'make clean' target does not remove them).
* Add some comments.
* Set a NAME_RESOURCES variable in MinGWResourceCompiler.
* Fix looking for zlib under msys (C:\msys\1.0). Minizip now builds under windows with external zlib.