icamerasrc: fix compilation

pkgs/development/libraries/gstreamer/icamerasrc/default.nix

···
   ];
 
   NIX_CFLAGS_COMPILE = [
+    "-Wno-error"
     # gstcameradeinterlace.cpp:55:10: fatal error: gst/video/video.h: No such file or directory
     "-I${gst_all_1.gst-plugins-base.dev}/include/gstreamer-1.0"
   ];