Add CMAKE_C_COMPILER on windows, where $CC is exported in the env
Add CMAKE_C_COMPILER on windows, where $CC is exported in the env

nzjrs/cerbero,multipath-rtp/cerbero,flexVDI/cerbero,fluendo/cerbero,centricular/cerbero,shoreflyer/cerbero,GStreamer/cerbero,ford-prefect/cerbero,nirbheek/cerbero-old,superdump/cerbero,nzjrs/cerbero,multipath-rtp/cerbero,centricular/cerbero,multipath-rtp/cerbero,cee1/cerbero-mac,AlertMe/cerbero,nirbheek/cerbero,BigBrother-International/gst-cerbero,ramaxlo/cerbero,shoreflyer/cerbero,ikonst/cerbero,ford-prefect/cerbero,nzjrs/cerbero,justinjoy/cerbero,justinjoy/cerbero,nzjrs/cerbero,multipath-rtp/cerbero,sdroege/cerbero,brion/cerbero,GStreamer/cerbero,flexVDI/cerbero,OptoFidelity/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,atsushieno/cerbero,ramaxlo/cerbero,fluendo/cerbero,OptoFidelity/cerbero,EricssonResearch/cerbero,EricssonResearch/cerbero,nirbheek/cerbero,ramaxlo/cerbero,ford-prefect/cerbero,jackjansen/cerbero-2013,GStreamer/cerbero,lubosz/cerbero,cee1/cerbero-mac,BigBrother-International/gst-cerbero,OptoFidelity/cerbero,lubosz/cerbero,atsushieno/cerbero,BigBrother-International/gst-cerbero,nzjrs/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,jackjansen/cerbero-2013,AlertMe/cerbero,ramaxlo/cerbero,flexVDI/cerbero,nicolewu/cerbero,ikonst/cerbero,ford-prefect/cerbero,fluendo/cerbero,superdump/cerbero,jackjansen/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,ylatuya/cerbero,GStreamer/cerbero,EricssonResearch/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,atsushieno/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,cee1/cerbero-mac,multipath-rtp/cerbero,shoreflyer/cerbero,ylatuya/cerbero,EricssonResearch/cerbero,ikonst/cerbero,sdroege/cerbero,nicolewu/cerbero,lubosz/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,nirbheek/cerbero,centricular/cerbero,atsushieno/cerbero,davibe/cerbero,jackjansen/cerbero,centricular/cerbero,BigBrother-International/gst-cerbero,fluendo/cerbero,ikonst/cerbero,nirbheek/cerbero-old,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,nirbheek/cerbero-old,jackjansen/cerbero,davibe/cerbero,centricular/cerbero,sdroege/cerbero,superdump/cerbero,AlertMe/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,shoreflyer/cerbero,ramaxlo/cerbero,shoreflyer/cerbero,superdump/cerbero,davibe/cerbero,ylatuya/cerbero,OptoFidelity/cerbero,davibe/cerbero,nirbheek/cerbero,fluendo/cerbero,flexVDI/cerbero,lubosz/cerbero,jackjansen/cerbero,jackjansen/cerbero-2013,AlertMe/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,justinjoy/cerbero,atsushieno/cerbero,sdroege/cerbero,EricssonResearch/cerbero,brion/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,ikonst/cerbero,nirbheek/cerbero-old,GStreamer/cerbero,brion/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,flexVDI/cerbero,jackjansen/cerbero-2013,brion/cerbero,brion/cerbero,sdroege/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,jackjansen/cerbero-2013,ylatuya/cerbero,nicolewu/cerbero,AlertMe/cerbero,cee1/cerbero-mac,BigBrother-International/gst-cerbero,justinjoy/cerbero