pidgin/pidgin

Add PURPLE_VERSION and PURPLE_EXTRA_VERSION to libpurple/version.h and clean up some other related stuff
subdir('bonjour')
subdir('facebook')
subdir('gg')
subdir('irc')
subdir('jabber')
subdir('novell')
subdir('null')
subdir('sametime')
subdir('silc')
subdir('simple')
subdir('zephyr')