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 anni fa
..
testdata	eb72d50f44 Import gcc 5.2.0 from tarball	9 anni fa
gunzip.go	eb72d50f44 Import gcc 5.2.0 from tarball	9 anni fa
gunzip_test.go	eb72d50f44 Import gcc 5.2.0 from tarball	9 anni fa
gzip.go	eb72d50f44 Import gcc 5.2.0 from tarball	9 anni fa
gzip_test.go	eb72d50f44 Import gcc 5.2.0 from tarball	9 anni fa