Add CVS version labels to all install/uninstall scripts.

contrib/adminpack/adminpack.sql.in

contrib/adminpack/uninstall_adminpack.sql

contrib/btree_gist/btree_gist.sql.in

contrib/btree_gist/uninstall_btree_gist.sql

contrib/chkpass/chkpass.sql.in

contrib/chkpass/uninstall_chkpass.sql

contrib/cube/cube.sql.in

contrib/cube/uninstall_cube.sql

contrib/dblink/dblink.sql.in

contrib/dblink/uninstall_dblink.sql

contrib/dict_int/dict_int.sql.in

contrib/dict_int/uninstall_dict_int.sql

contrib/dict_xsyn/dict_xsyn.sql.in

contrib/dict_xsyn/uninstall_dict_xsyn.sql

contrib/earthdistance/earthdistance.sql.in

contrib/earthdistance/uninstall_earthdistance.sql

contrib/fuzzystrmatch/fuzzystrmatch.sql.in

contrib/fuzzystrmatch/uninstall_fuzzystrmatch.sql

contrib/hstore/hstore.sql.in

contrib/hstore/uninstall_hstore.sql