Don't fail when locale env. vars specify a dot-less locale name.

Don't fail when locale env. vars specify a dot-less locale name.

Fixes <http://bugs.gnu.org/10742>.
Reported by Alírio Eyng <alirioeyng@ig.com.br>.

* gnulib-local/lib/localcharset.c.diff (environ_locale_charset): Change
  to set CODESET to "" when LOCALE lacks a dot.  Return "ISO-8859-1"
  when CODESET is the empty string.

* lib/localcharset.c: Update.

* test-suite/standalone/Makefile.am (check_SCRIPTS): Add
  `test-command-line-encoding2'.
  (TESTS): Likewise.

* test-suite/standalone/test-command-line-encoding2: New file.