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b10d3e65 - Silence "use of possibly-NULL ‘msgstr’" warnings.

Silence "use of possibly-NULL ‘msgstr’" warnings. * gettext-tools/src/write-po.c: Include verify.h. (message_print_comment_filepos): Assume that this xasprintf call returns non-NULL. * gettext-tools/src/xg-message.c: Include verify.h. (remember_a_message, remember_a_message_plural): Assume that this xasprintf call returns non-NULL. * gettext-tools/src/xgettext.c: Include verify.h. (construct_header): Assume that this xasprintf call returns non-NULL.