libgnt/libgnt

Remove extra file references from docs.
release-2.x.y
2019-05-24, Elliott Sales de Andrade
f444cae76500
Remove extra file references from docs.

gntversion.h only exists on default, not release-2.x.y, and the other
API indices are not needed since nothing was added in those versions.
plugindir = get_option('libdir') + '/gnt'
irssi = library('irssi', 'irssi.c',
dependencies : [ncurses, gobject, libgnt_dep],
name_prefix : '',
install : true, install_dir : plugindir)
s = library('s', 's.c',
dependencies : [ncurses, gobject, libgnt_dep],
name_prefix : '',
install : true, install_dir : plugindir)