gst-validate.recipe: Pass -Wno-error when targetting Windows
gst-validate.recipe: Pass -Wno-error when targetting Windows

gst-validate-runner.c: In function 'gst_validate_init_runner':
gst-validate-runner.c:840:1: error: visibility attribute not supported in this configuration; ignored [-Werror=attributes]
cc1: all warnings being treated as errors

This error is incomprehensible. There is no visibility attribute there.

centricular/cerbero,atsushieno/cerbero,GStreamer/cerbero,fluendo/cerbero,fluendo/cerbero,nirbheek/cerbero,GStreamer/cerbero,fluendo/cerbero,atsushieno/cerbero,GStreamer/cerbero,atsushieno/cerbero,fluendo/cerbero,centricular/cerbero,GStreamer/cerbero,nirbheek/cerbero,atsushieno/cerbero,nirbheek/cerbero,centricular/cerbero,nirbheek/cerbero,centricular/cerbero,fluendo/cerbero,GStreamer/cerbero,atsushieno/cerbero,centricular/cerbero