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bd94293c - msgmerge, msginit: Reject POT files with non-ASCII characters, except in UTF-8.

msgmerge, msginit: Reject POT files with non-ASCII characters, except in UTF-8. Reported by Martin Quinson <mquinson@debian.org> at <https://savannah.gnu.org/bugs/?65104>. * gettext-tools/src/msgl-charset.h (check_pot_charset): New declaration. * gettext-tools/src/msgl-charset.c: Include msgl-ascii.h. (check_pot_charset): New function. * gettext-tools/src/msginit.c: Include msgl-charset.h. (main): Invoke check_pot_charset. * gettext-tools/src/msgmerge.c: Include msgl-charset.h. (merge): Invoke check_pot_charset. * gettext-tools/src/FILES: Update. * gettext-tools/tests/testdata/nonascii.pot: New file. * gettext-tools/tests/msginit-5: New file. * gettext-tools/tests/msgmerge-charset-4: New file. * gettext-tools/tests/Makefile.am (TESTS): Add them. (EXTRA_DIST): Add testdata/nonascii.pot.