pidgin/pidgin

Use LT_LIB_M to determine if we need to link to the math library and link Pidgin to the X11 libraries
release-2.x.y
2021-04-11, Gary Kramlich
132d17234930
Use LT_LIB_M to determine if we need to link to the math library and link Pidgin to the X11 libraries

Gentoo ran into an issue with the gold linker without -lm. The original patch
and work came from Justin Lechner. https://bugs.gentoo.org/386079

Gentoo also ran into an issue with X11_LIBS not being added to pidgin. This
should already be implicit everywhere except for homebrew which patches X11
out of their build. Original patch/work came from and. https://bugs.gentoo.org/500762

Testing Done:
Installed and ran locally.

Reviewed at https://reviews.imfreedom.org/r/608/
/** @page sound-signals Sound Signals
@signals
@signal playing-sound-event
@endsignals
@see sound.h
<hr>
@signaldef playing-sound-event
@signalproto
gboolean (*playing_sound_event)(PurpleSoundEventID event, PurpleAccount *account);
@endsignalproto
@signaldesc
Emitted when libpurple is going to play a sound event. This can be used to cancel playing sound by returning TRUE.
@param event The event this sound represents.
@param account The account the sound is being played for.
@return @c TRUE if the sound should not be played, or @c FALSE otherwise.
@endsignaldef
*/
// vim: syntax=c.doxygen tw=75 et