Backport of mingw 6.3.0 from Fedora 24 to EL 7.
This is a companion discussion topic for the original entry at https://copr.fedorainfracloud.org/coprs/godsic/MinGW-6.3.0/
This is a companion discussion topic for the original entry at https://copr.fedorainfracloud.org/coprs/godsic/MinGW-6.3.0/