Win64 MinGW

[Daniel Green]

Thought I'd post an update.  I spent last weekend building the support 
libraries for MinGW-w64.  I also took the opportunity to automate the 
build process from start to finish.

I had to do this inside VirtualBox which not only adds significantly to 
compiling, the latest version(4.0.4) kept locking up.  I see they just 
released 4.0.6, but 4.0 works so I'm going to stick with that for now.

I've been attempting to duplicate the TDM64 build process but met with 
issues in gtype-desc.c.  The errors appear to be undefined types due to 
lto support.

I've disabled lto(rebuilding now).  If it works I'll integrate GDC into 
the process and see about adding lto in later.