* Move the nss/libevent/sqlite dependencies to separate blocks, allowing
to disable them by defining MOZILLA_USE_BUNDLED_NSS|SQLITE|LIBEVENT.
Gecko 44 doesn't build against our base libevent1, and it's simpler to
use the bundled/patched libevent instead of ports libevent2. This should
also help tbb which insists on using its own (heavily patched) nss
* Bump sqlite dependency, gecko 44 requires sqlite 3.9.1
* Fix debug FLAVOR, use only --enable-debug-symbols=yes
--disable-install-strip. The resulting pkg is only around 280Mb, and
unstripped libxul is 800Mb. Adventurous users can show it to gdb.
* Rework the way default value is set for WRKDIST, soon (with esr45)
xulrunner will be the only exception left
* Remove unused _MOZDIR definition
b1a3022d1a