Patch to make configure & make work correctly on MinGW

[Jason Green]

There were some unresolved issues in the current SVN which made
compiling a non-trivial task on MinGW.  I believe this patch fixes
those issues.  Also, the Command Prompt window is now gone when
you just want to run Pingus  (have to compile with the "-mwindows"
option).

However, can someone please test this out on a linux box before
committing it?  I don't have a linux dev machine set up yet, so I
can't do it.  These additions should make compiling for MinGW (as
well as Linux) as simple as:

Download, compile, and install ClanLib from svn

Download pingus from svn
./autogen.sh
./configure
./make

If you're missing any libraries, I don't think Clanlib would compile
either... Not sure if pingus requires anything that clanlib doesn't
besides an iconv implementation.

Also, I'm not even close to a configure/makefile guru, so if there are
better ways to do what my patch does, by all means, fix it! 
Thanks!

Jason

configure_mingw.diff
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