build-sys: Allows spec file to build MingW packages
Add MingW support. This allows to build MingW packages easily with a
$ rpmbuild -ta spice-protocol-XXXX.tar.xz
This is base on some work by Eduardo Lima adding MingW support to SPEC files. Part of dependencies, description and names came from Fedora SPEC file for mingw-spice-protocol package.
Signed-off-by: Frediano Ziglio fziglio@redhat.com Signed-off-by: Victor Toso victortoso@redhat.com