cross-localedef-native: add way to specify which locale archive to write
localedef has no way to specify which locale archive to use, and the
compile-time default isn't useful as it points to the work directory.
Add support to read an environmental variable for the path, and don't fail to
write a new locale archive.
(From OE-Core rev:
bf0f205a3c3714926649bd69db29e4df1c0ea112)
(From OE-Core rev:
14bcbecb6c19367ae0864a27750c8ea24681d48f)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
