firefox: Update to 33.0

(cherry picked from commit fc964fa9243eec0686b0892fb8dac7920d3bb72a)
firefox: Fix build on 32-bit by using the gold linker

(cherry picked from commit f4b5671b0d9e8904a4ad6b3fd852685ec75b517b)
firefox: Fix evaluation on non-Linux

Actually we only support Firefox on Linux, but we hit the “attribute
‘gcc.override’ missing” error before the platform check.

(cherry picked from commit a5262a9000258b8bbe1cc5e48c8cc2fcfe95233f)
firefox: Update to 33.0.1

(cherry picked from commit 240665d906b661bbcfff95db97cb79b528e7b82b)
Update firefox

(cherry picked from commit ed6babd39131a95047b4fd849bfa9b836b113dbd)
nss: Update to 3.17.2

(cherry picked from commit f445fb824015e771ec09d7cbe9da69d456353816)
firefox: Don't use system sqlite

I don't want to upgrade SQLite in the stable branch, but Firefox 33
requires a more recent version.