Adding a new thread model to GCC

[lh_mouse]

Thanks to ktietz, Elieux, mingwandroid (via IRC) and jwakely (via mail), 
the integration of mcfgthread and gcc has been accomplished.

This 9000- patch applies to the gcc-5-branch after all other patches from
https://github.com/Alexpux/MINGW-packages/tree/master/mingw-w64-gcc-git are applied.
After applying the patches please run 'configure' with --enable-threads=mcf.
The newly compiled i686 gcc has passed 3-stages bootstrap and seems working.
I am going to start the x64 build very soon.

Source code and pre-built binaries of the 'mcfgthread' library can be found here:
https://github.com/lhmouse/mcfgthread/tree/master/release
Problem reports and suggestions are welcome. :>

Thanks for your help and interest!


------------------				 
Best regards,
lh_mouse
2016-04-19
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