pgsql: Add postgres.h to *.c files for pg_upgrade, ltree, and btree_gis

Add postgres.h to *.c files for pg_upgrade, ltree, and btree_gist, and
remove from local *.h files.

Per suggestion from Alvaro.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/f1312b5ed32630ae479e61e2a58cfac56ae46dd8

Modified Files
--------------
contrib/btree_gist/btree_bit.c | 2 ++
contrib/btree_gist/btree_bytea.c | 2 ++
contrib/btree_gist/btree_cash.c | 2 ++
contrib/btree_gist/btree_date.c | 2 ++
contrib/btree_gist/btree_float4.c | 2 ++
contrib/btree_gist/btree_float8.c | 2 ++
contrib/btree_gist/btree_gist.c | 2 ++
contrib/btree_gist/btree_gist.h | 1 -
contrib/btree_gist/btree_inet.c | 2 ++
contrib/btree_gist/btree_int2.c | 2 ++
contrib/btree_gist/btree_int4.c | 2 ++
contrib/btree_gist/btree_int8.c | 2 ++
contrib/btree_gist/btree_interval.c | 2 ++
contrib/btree_gist/btree_macaddr.c | 2 ++
contrib/btree_gist/btree_numeric.c | 2 ++
contrib/btree_gist/btree_oid.c | 2 ++
contrib/btree_gist/btree_text.c | 2 ++
contrib/btree_gist/btree_time.c | 2 ++
contrib/btree_gist/btree_ts.c | 2 ++
contrib/btree_gist/btree_utils_num.c | 2 ++
contrib/btree_gist/btree_utils_var.c | 2 ++
contrib/ltree/crc32.c | 2 ++
contrib/ltree/ltree.h | 1 -
contrib/pg_upgrade/check.c | 2 ++
contrib/pg_upgrade/controldata.c | 2 ++
contrib/pg_upgrade/dump.c | 2 ++
contrib/pg_upgrade/exec.c | 2 ++
contrib/pg_upgrade/file.c | 2 ++
contrib/pg_upgrade/function.c | 2 ++
contrib/pg_upgrade/info.c | 2 ++
contrib/pg_upgrade/option.c | 2 ++
contrib/pg_upgrade/page.c | 2 ++
contrib/pg_upgrade/pg_upgrade.c | 2 ++
contrib/pg_upgrade/pg_upgrade.h | 2 --
contrib/pg_upgrade/relfilenode.c | 2 ++
contrib/pg_upgrade/server.c | 2 ++
contrib/pg_upgrade/tablespace.c | 2 ++
contrib/pg_upgrade/util.c | 2 ++
contrib/pg_upgrade/version.c | 2 ++
contrib/pg_upgrade/version_old_8_3.c | 2 ++
40 files changed, 74 insertions(+), 4 deletions(-)