mingw build fixes

[Mark Spieth]

This patch set allows packaging/Win32 to build mythfrontend master on windows for windows with mingw. 32 bit XP has been tested.

Apply patches in any order.

Follow packaging/Win32/mythbuild.sh instructions on installing mingw.

Problems I have found building include

• build hangs (ctrl-C aborts and restart
• defunct processes (cant kill, use killdefunctor.pl in another term)

Helper scripts:

• run.sh is a sample with env variables so that git can find a local repo to clone from (with any stg or other private patches)
• killdefunctor.pl will kill any defunct processes which wont go away by themselves.

Any unavailable package versions please post and mythbuild.sh patch will be updated.