remake: do not create po files

The 'make update' was using wget to get the gmo and other gnu files from
upstream, since need to work cleanly in a non-networked or proxy environment
this does not so well.  Remove the list of languages from the LINGUAS file.

[YOCTO #3745]

Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
insane: remove unused variable

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>