pkgconfig: Fix nativesdk builds for mingw sdk hosts

pkgconfig uses a vendored version of ancient glib-2.0, which does not
have many of fixes that current glib-2.0 will have, we enable this
internal version for nativesdk/native recipe, which on mingw hosts does
not work well, as its missing necessary mingw support. This patch
backports couple of fixes which makes GCC11 happy

but its going to be a constant source of pain as long as we support mingw

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Joshua Watt <jpewhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>