webkitgtk: Fix build with chroot

pkgs/development/libraries/webkitgtk/default.nix

@@ -25,12 +25,10 @@ stdenv.mkDerivation rec {
 
   patches = [ ./webcore-svg-libxml-cflags.patch ];
 
+  CC = "cc";
+
   prePatch = ''
     patchShebangs Tools/gtk
-
-    for i in $(find . -name '*.p[l|m]'); do
-      sed -e 's@/usr/bin/gcc@gcc@' -i $i
-    done
   '';
 
   configureFlags = with stdenv.lib; [