meson: wasapi2,mediafoundation: Work around Windows SDK header issue

Some SDK headers are not standard compliant, so MSVC will
complain when such headers are in use with "/permissive-" compile
option. Use "/Zc:twoPhase-" to work around the issue as documented in
https://docs.microsoft.com/en-us/cpp/build/reference/permissive-standards-conformance?view=msvc-160#windows-header-issues
22 jobs for !1174 with win-sdk-workaround in 58 seconds
detached
Status Name Job ID Coverage
  Trigger
manual trigger #14821807
manual
 
  Build Docker
created fedora amd64 docker #14821808
passed gst-indent amd64 docker #14821809

00:00:22

created windows amd64 docker #14821810
windows shell 1809
 
  Preparation
passed gst indent #14821811

00:00:36

 
  Build
created build clang fedora x86_64 #14821815
created build documentation #14821819
created build msys2 #14821818
docker windows 1809 allowed to fail manual
created build nodebug fedora x86_64 #14821812
created build static fedora x86_64 #14821813
created build static nodebug fedora x86_64 #14821814
created build vs2017 amd64 #14821816
docker windows 1809
created build vs2017 x86 #14821817
docker windows 1809
created cerbero trigger #14821820
 
  Test
created check fedora #14821821
gstreamer
created integration testsuites fedora 1/4 #14821822
gstreamer
created integration testsuites fedora 2/4 #14821823
gstreamer
created integration testsuites fedora 3/4 #14821824
gstreamer
created integration testsuites fedora 4/4 #14821825
gstreamer
created valgrind bad #14821826
gstreamer
created valgrind ges #14821827
gstreamer
 
  Integrate
created gstreamer-full-minimal #14821828