Magic blocks don't do us any good unless we use 'em ... so install one

contrib/btree_gist/btree_gist.c

contrib/chkpass/chkpass.c

contrib/cube/cube.c

contrib/dblink/dblink.c

contrib/dbmirror/pending.c

contrib/earthdistance/earthdistance.c

contrib/fulltextindex/fti.c

contrib/fuzzystrmatch/fuzzystrmatch.c

contrib/intagg/int_aggregate.c

contrib/intarray/_int_op.c

contrib/isbn_issn/isbn_issn.c

contrib/lo/lo.c

contrib/ltree/ltree_op.c

contrib/pg_buffercache/pg_buffercache_pages.c

contrib/pg_freespacemap/pg_freespacemap.c

contrib/pg_trgm/trgm_op.c

contrib/pgcrypto/pgcrypto.c

contrib/pgrowlocks/pgrowlocks.c

contrib/pgstattuple/pgstattuple.c

contrib/seg/seg.c