remove deprecated 'languages' parameter of gnome.yelp()

Since version 0.43 Meson automatically reads the LINGUAS file.

help/meson.build

@@ -18,21 +18,7 @@ geary_help_media = [
   'figures/geary.svg'
 ]
 
-# Meson 0.44 added support for automatically reading LINGUAS, until we
-# can depend on that, read it in outselves. Note this means if you
-# change LINGUAS, you will need remove your build directory and re-run
-# meson for it to be picked up.
-linguas = run_command(['cat', 'LINGUAS']).stdout().strip()
-langs = []
-foreach line : linguas.split('\n')
-  line = line.strip()
-  if not line.startswith('#')
-    langs += line
-  endif
-endforeach
-
 gnome.yelp(meson.project_name(),
-  languages: langs,
   sources: geary_help_pages,
   media: geary_help_media
 )

meson.build

@@ -1,7 +1,7 @@
 project('geary', [ 'vala', 'c' ],
   version: '0.13-dev',
   license: 'LGPL2.1+',
-  meson_version: '>= 0.41',
+  meson_version: '>= 0.43',
 )
 
 gnome = import('gnome')