ruby: remove references to CC by default

This makes RbConfig["CC"] return an invalid path, but I hope nothing
is depending on that anyway...

pkgs/development/interpreters/ruby/default.nix

@@ -49,7 +49,7 @@ let
       # puts a reference to the C compiler in the binary.
       # This might be required by some gems at runtime,
       # but we allow to strip it out for smaller closure size.
-      , removeReferencesTo, removeReferenceToCC ? false
+      , removeReferencesTo, removeReferenceToCC ? true
       , autoreconfHook, bison, autoconf
       , buildEnv, bundler, bundix
       , libiconv, libobjc, libunwind, Foundation

pkgs/top-level/all-packages.nix

@@ -9409,8 +9409,6 @@ in
     docSupport = false;
     yamlSupport = false;
     fiddleSupport = false;
-    # remove gcc from runtime closure
-    removeReferenceToCC = true;
   };
 
   ruby = ruby_2_6;