More cleanups of the include files

src/include/access/funcindex.h

src/include/catalog/catalog.h

src/include/catalog/catname.h

src/include/catalog/heap.h

src/include/catalog/index.h

src/include/catalog/indexing.h

src/include/catalog/pg_aggregate.h

src/include/catalog/pg_am.h

src/include/catalog/pg_amop.h

src/include/catalog/pg_amproc.h

src/include/catalog/pg_attribute.h

src/include/catalog/pg_class.h

src/include/catalog/pg_database.h

src/include/catalog/pg_defaults.h

src/include/catalog/pg_demon.h

src/include/catalog/pg_group.h

src/include/catalog/pg_hosts.h

src/include/catalog/pg_index.h

src/include/catalog/pg_inheritproc.h

src/include/catalog/pg_inherits.h