GCC 4.5: Remove unnecessary `configure' flags.

The `--enable-lto' and `--enable-plugin' flags are automatically implied
when all their prerequisites are satisfied.  However, passing them
explicitly breaks cases where some of the prerequisites are not met,
such as static (`--without-headers') cross-compilers.

svn path=/nixpkgs/trunk/; revision=22316

pkgs/development/compilers/gcc-4.5/default.nix

@@ -204,8 +204,6 @@ stdenv.mkDerivation ({
     --disable-libstdcxx-pch
     --without-included-gettext
     --with-system-zlib
-    --enable-lto
-    --enable-plugin
     --enable-languages=${
       concatStrings (intersperse ","
         (  optional langC        "c"