dev-util/mingw64-runtime: filter -Wl,-z,* ... for CFLAGS

strip-unsupported-flags handles this fine in LDFLAGS, but -Wl,*
are no-ops during compile-only tests (thus not stripped) and then
if a package compiles and links anything at same time it fails.

This used not to be a big problem but now that 23.0 profiles
do -Wl,-z,pack-relative-relocs (mingw ld has no -z) this is
hitting bashrc-mv users that tend to do CFLAGS="${LDFLAGS}"
by default. Tempting to ignore it because of how wrong it is,
but well.

An alternate route could be to eventually have strip-flags
and/or strip-unsupported-flags remove -Wl,* from non-LDFLAGS
given this could affect more than mingw (e.g. switching to
bfd when there is a lld-only option).

Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

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