httpd-2.2: Enable building of mod_cache and friends

(cherry picked from commit db4053fb590d72f68da681b3460e1cecb103c294)
Update firefox source build, too

(cherry picked from commit 0934ddf3e0657c56253c5de305406700f52f2574)
firefox: update to 33.1

(cherry picked from commit fb3e83d091532fc63e55a063515e66bfaa014e0d)
Update ImageMagick version

(cherry picked from commit cd1bacb03d5d18460de215a0c7967a4a829f7964)
imagemagick: Use --with-gcc-arch

Without this, ImageMagick's configure script will generate code
specific to the machine building the package. This code may then fail
on other CPU types.

http://hydra.nixos.org/build/16564129
Signed-off-by: Domen Kožar <domen@dev.si>
(cherry picked from commit 6f538863607474fd09895723abae62198264bb5c)