rewtguy/pidgin

Update some deprecated api in gtksavedstatues.c that was missed.

Testing Done:
Verified the substatus okay and cancel buttons continued to work as expected.

Reviewed at https://reviews.imfreedom.org/r/918/
NULL_SOURCES = [
'nullprpl.h',
'nullprpl.c'
]
# nullprpl isn't built by default; when it is built, it's dynamically linked
if DYNAMIC_NULL
null_prpl = shared_library('null', NULL_SOURCES,
dependencies : [libpurple_dep, glib],
install : false, install_dir : PURPLE_PLUGINDIR)
endif