* Remove unused `ZSetFD`.
* Remove `__HM_set` which is never read.
* Remove `__Zephyr_open` global, which is redundant with `__Zephyr_fd != -1`.
* Remove `ZSetSrv.c`, as `ZSetServerState` is never called.
Consequently, remove `__Zephyr_server` global and all things that check it as it will never be TRUE.
* Remove zephyr internal debug code, as `ZSetDebug` is never called.
Also, make a couple debug messages go to libpurple.
* Remove unused `ZNewLocateUser` compatibility macro.
Testing Done:
Compile only.
Reviewed at https://reviews.imfreedom.org/r/249/
# UPDATING VERSION NUMBERS FOR RELEASES
#
# The version number is:
# <major>.<minor>.<micro><extra>
#
# micro += 1
#
# If any functions have been added to libpurple, Pidgin, or Finch:
# micro = 0
# minor += 1
#
# If backwards compatibility has been broken in libpurple, Pidgin, or Finch:
# micro = 0
# minor = 0
# major += 1
# purple_soversion += 1
#
# extra should be similar to one of the following: