* Move `_purple_fstat` to silc and rename to `silcpurple_fstat`
* Replace unknown `g_fchmod` with `fchmod`
* Fix `PurpleProtocol*` prototypes
* Derive `SilcPurpleXfer` from `PurpleXfer`
Testing Done:
Compile.
Bugs closed: PIDGIN-17436
Reviewed at https://reviews.imfreedom.org/r/481/
# 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: