libgettextpo: Remove static variable pass_obsolete_entries.
* gettext-tools/src/read-catalog-abstract.h (ABSTRACT_CATALOG_READER_TY): Add
pass_obsolete_entries field.
* gettext-tools/src/read-catalog-abstract.c (catalog_reader_alloc): Initialize
the pass_obsolete_entries field.
* gettext-tools/src/read-catalog.c (read_catalog_stream): Assign the
pass_obsolete_entries field, instead of calling po_lex_pass_obsolete_entries.
* gettext-tools/src/msgfmt.c (read_catalog_file_msgfmt): Likewise.
* gettext-tools/src/po-lex.h (pass_obsolete_entries): Remove declaration.
(po_lex_pass_obsolete_entries): Remove declaration.
* gettext-tools/src/po-lex.c (pass_obsolete_entries): Remove variable.
(po_lex_pass_obsolete_entries): Remove function.
* gettext-tools/src/po-gram-gen.y: Update.
* gettext-tools/woe32dll/gettextsrc-exports.c (pass_obsolete_entries): Remove
export.
