gst-rtsp-server-1.0.recipe: Add -Wno-error to CFLAGS
gst-rtsp-server-1.0.recipe: Add -Wno-error to CFLAGS

All other recipes do this and it helps make builds more robust for users
and on the CI

EricssonResearch/cerbero,atsushieno/cerbero,justinjoy/cerbero,fluendo/cerbero,shoreflyer/cerbero,fluendo/cerbero,centricular/cerbero,flexVDI/cerbero,multipath-rtp/cerbero,multipath-rtp/cerbero,shoreflyer/cerbero,atsushieno/cerbero,flexVDI/cerbero,OptoFidelity/cerbero,EricssonResearch/cerbero,EricssonResearch/cerbero,flexVDI/cerbero,fluendo/cerbero,fluendo/cerbero,EricssonResearch/cerbero,shoreflyer/cerbero,atsushieno/cerbero,OptoFidelity/cerbero,nirbheek/cerbero,atsushieno/cerbero,GStreamer/cerbero,centricular/cerbero,GStreamer/cerbero,EricssonResearch/cerbero,centricular/cerbero,shoreflyer/cerbero,GStreamer/cerbero,GStreamer/cerbero,multipath-rtp/cerbero,multipath-rtp/cerbero,flexVDI/cerbero,shoreflyer/cerbero,nirbheek/cerbero,atsushieno/cerbero,nirbheek/cerbero,GStreamer/cerbero,centricular/cerbero,OptoFidelity/cerbero,fluendo/cerbero,justinjoy/cerbero,nirbheek/cerbero,OptoFidelity/cerbero,flexVDI/cerbero,justinjoy/cerbero,multipath-rtp/cerbero,justinjoy/cerbero,centricular/cerbero