0950-11.2.0-configure-msys2.patch: drop everything and patch the cygwin
paths instead. One hunk re SUPPORTS_WEAK is dropped since I don't think
that does anything for cygwin.
0951-11.2.0-msys2-spec.patch: compare everything and patch the cygwin
files instead. I'm not sure if the multilib change does anything, but
keeping it anyway.
0953-11.2.0-testsuite-msys2.patch: no longer needed, all conditions
are true with the cygwin triplet.
fe07ffff5c