Add typdefs to pgindent run.

contrib/array/array_iterator.c

src/backend/access/common/tupdesc.c

src/backend/access/gist/gist.c

src/backend/access/hash/hash.c

src/backend/access/hash/hashovfl.c

src/backend/access/hash/hashpage.c

src/backend/access/hash/hashsearch.c

src/backend/access/heap/heapam.c

src/backend/access/nbtree/nbtpage.c

src/backend/access/nbtree/nbtree.c

src/backend/access/nbtree/nbtscan.c

src/backend/access/nbtree/nbtsearch.c

src/backend/access/nbtree/nbtsort.c

src/backend/access/rtree/rtproc.c

src/backend/access/rtree/rtree.c

src/backend/access/transam/transam.c

src/backend/access/transam/transsup.c

src/backend/bootstrap/bootstrap.c

src/backend/catalog/heap.c

src/backend/catalog/indexing.c