[PATCH, mingw32]: Port FTZ/DAZ for SSE to mingw32

[Uros Bizjak]

Hello!

>> > PR target/29498
>> > * config.gcc: Add i386/t-crtfm to tm-file.
>> > * i386/mingw32.h: (ENDFILE_SPEC): New.
>> > * i386/t-crtfm: Force -minline-all-stringops to remove

> What has happened for this patch?

It is waiting for someone to commit it to SVN. I can't test it on
mingw target, but if it works for you, I'll commit it to SVN.

Uros.
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