perl-packages.nix: partially revert 7a459962331e095c

The commit referred to non-existent license "stdenv.lib.licenses.perl5".
quassel: fix wrapper for all flag values
chromium: Update all channels to latest versions.

With this commit, the following new upstream versions are introduced:

stable: 35.0.1916.153 -> 36.0.1985.125
beta:   36.0.1985.84  -> 37.0.2062.44
dev:    37.0.2054.3   -> 38.0.2101.0

All builds were successfully tested on my machine, however in order to
update the beta and dev channels, a few additional modifications were
necessary:

 * Don't update address_input_strings.grdp anymore because this has been
   done/fixed upstream and was relevant in version 37.0.2054.3 _only_.
 * No need to fix references to /usr/bin/gcc in version 38 anymore.
 * Constrain patch for Angle (introduced in 4cbedd7) to version 37 only,
   because it already has been applied upstream in version 38.
 * Drop user namespaces patch for version 31 up until version 35,
   because version 36 is already in stable.
 * Don't try to build bundled Clang and/or even build using Clang.
 * Remove obsolete patchPhase commands that are specific to version 35
   and older.

While testing the dev version 38 I came accross a font rendering issue
which needs to be addressed ASAP (perhaps related to #3187), however the
browser works otherwise.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>