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.

MYTHGIT env variable is the base of the repos and contains packahing and mythtv amongst others.

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