pidgin/pidgin

Fix a ton of missing and incorrect global header guards

2022-03-11, Gary Kramlich
03f98ece6b26
Fix a ton of missing and incorrect global header guards

Testing Done:
Compiled and ran.

Reviewed at https://reviews.imfreedom.org/r/1321/
libpurple/data/purple-url-handler.desktop.in
libpurple/protocols/null/nullprpl.c
pidgin/data/im.pidgin.Pidgin.desktop.in
sub/libpurple/data/purple-url-handler.desktop.in
sub/libpurple/protocols/null/nullprpl.c
sub/pidgin/data/im.pidgin.Pidgin.desktop.in