pidgin/pidgin

Switch join_paths and + to /.

2020-09-16, Elliott Sales de Andrade
c0ea70247280
Switch join_paths and + to /.

Testing Done:
Ran `ninja install`, though didn't actually check the results.

Reviewed at https://reviews.imfreedom.org/r/121/
subdir('bonjour')
subdir('facebook')
subdir('gg')
subdir('irc')
subdir('jabber')
subdir('novell')
subdir('null')
subdir('sametime')
subdir('silc')
subdir('simple')
subdir('zephyr')