pidgin/pidgin

Fix build with clang 11.0.0

2020-10-14, Steve Wills
6af4d993c8e5
Fix build with clang 11.0.0

Testing Done:
Built on FreeBSD 13 CURRENT with clang 11.0.0

Built on debian unstable with gcc to verify no changes there. -GK

Reviewed at https://reviews.imfreedom.org/r/167/
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