Remove unnecessary trailing comma in struct initializers.
* gettext-tools/src/msgattrib.c (long_options): Remove trailing comma in
initializer.
* gettext-tools/src/msgcat.c (long_options): Likewise.
* gettext-tools/src/msgcomm.c (long_options): Likewise.
* gettext-tools/src/msgconv.c (long_options): Likewise.
* gettext-tools/src/msgen.c (long_options): Likewise.
* gettext-tools/src/msgfilter.c (long_options): Likewise.
* gettext-tools/src/msgmerge.c (long_options): Likewise.
* gettext-tools/src/msgunfmt.c (long_options): Likewise.
* gettext-tools/src/msguniq.c (long_options): Likewise.
* gettext-tools/src/xgettext.c (long_options): Likewise.
