rewtguy/pidgin

move the zephyr protocol plugins icons to a resource in the plugin

Testing Done:
Ran in devenv with a logo inverted (which was reverted before committing).

Reviewed at https://reviews.imfreedom.org/r/981/
subdir('libpurple')
subdir('protocols')
if ENABLE_GTK
subdir('pidgin')
else
pidgin_doc = []
endif
if enable_consoleui
subdir('finch')
else
finch_doc = []
endif
alias_target('doc', libpurple_doc, protocols_doc, pidgin_doc, finch_doc)