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63f1018d - tests: Add test for msginit CLDR support

tests: Add test for msginit CLDR support * gettext-tools/tests/msginit-4: New file. * gettext-tools/tests/common/supplemental/plurals.xml: New data file. * gettext-tools/tests/Makefile.am (TESTS): Add new tests. (EXTRA_DIST): Add new data file.