Merge remote-tracking branch 'remotes/kraxel/tags/modules-20201029-pull-request' into staging

modules: build virtio-gpu-pci & virtio-vga modular.
modules: various bugfixes, mostly for macos.

# gpg: Signature made Thu 29 Oct 2020 11:09:41 GMT
# gpg:                using RSA key 4CB6D8EED3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>" [full]
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>" [full]
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>" [full]
# Primary key fingerprint: A032 8CFF B93A 17A7 9901  FE7D 4CB6 D8EE D3E8 7138

* remotes/kraxel/tags/modules-20201029-pull-request:
  modules: turn off lazy binding
  modules: unbreak them on macos
  virtio-gpu: only compile virtio-gpu-3d.c for CONFIG_VIRGL=y
  virtio-gpu: add virtio-vga module
  virtio-gpu: add virtio-gpu-pci module

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>