Emacs 24.3

This version supports native fullscreen support, so we remove the patch
adding 'ns-toggle-fullscreen'

While around, move removing ctags to its own method instead of copy
pasting code.

bz2 format tarball is now replaced with xz while gz is still offered.
Instead of declaring dependency on xz, go back to using gz.  XZ saves
32% compared to GZ where the difference for this version's tarball is
roughly 16MB.