shaderc: mark as broken

(cherry picked from commit 2ccdac8c9e79030aca144137d0479065ce40fbb8)

pkgs/development/compilers/shaderc/default.nix

···
   meta = with stdenv.lib; {
     inherit (src.meta) homepage;
     description = "A collection of tools, libraries and tests for shader compilation.";
+    broken = true;
   };
 }