compcert: cheat to get test to pass

ccomp apparently can't parse /usr/include/stdio.h on OS X.
pluralize formulae in tap/untap

Closes #28560.
Mozilla add-on SDK 1.16

Closes #29552.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
[i18nbrew] Merge branch 'master' of git://github.com/Homebrew/homebrew