libgettextpo: Remove static variable 'directory'.
* gettext-tools/src/read-catalog-file.h: New file, extracted from
gettext-tools/src/read-catalog.h.
* gettext-tools/src/read-catalog.h (read_catalog_file): Remove declaration.
* gettext-tools/src/read-catalog-file.c: New file, extracted from
gettext-tools/src/read-catalog.c.
* gettext-tools/src/read-catalog.c: Don't include open-catalog.h.
(read_catalog_file): Remove function.
* gettext-tools/src/msgl-cat.c: Include read-catalog-file.h instead of
read-catalog.h.
* gettext-tools/src/msgattrib.c: Likewise.
* gettext-tools/src/msgcmp.c: Likewise.
* gettext-tools/src/msgconv.c: Likewise.
* gettext-tools/src/msgen.c: Likewise.
* gettext-tools/src/msgexec.c: Likewise.
* gettext-tools/src/msgfilter.c: Likewise.
* gettext-tools/src/msgfmt.c: Likewise.
* gettext-tools/src/msggrep.c: Likewise.
* gettext-tools/src/msginit.c: Likewise.
* gettext-tools/src/msgmerge.c: Likewise.
* gettext-tools/src/FILES: Mention read-catalog-file.h, read-catalog-file.c.
* gettext-tools/src/Makefile.am (noinst_HEADERS): Add read-catalog-file.h.
(libgettextsrc_la_SOURCES): Add read-catalog-file.c.
* gettext-tools/libgettextpo/Makefile.am (libgettextpo_la_AUXSOURCES): Remove
dir-list.c, open-catalog.c.
