nnesse/minwin-gcc-5-2: A patched gcc 5.2 enabling a new 'minwin' target that does not link to the Microsoft C library.

Niels Nesse eb72d50f44 Import gcc 5.2.0 from tarball		9 lat temu
..
grouping.h	eb72d50f44 Import gcc 5.2.0 from tarball	9 lat temu
mpn2flt128.c	eb72d50f44 Import gcc 5.2.0 from tarball	9 lat temu
strtod_l.c	eb72d50f44 Import gcc 5.2.0 from tarball	9 lat temu
strtoflt128.c	eb72d50f44 Import gcc 5.2.0 from tarball	9 lat temu
tens_in_limb.c	eb72d50f44 Import gcc 5.2.0 from tarball	9 lat temu