pgsql: Remove many -Wcast-qual warnings

Remove many -Wcast-qual warnings

This addresses only those cases that are easy to fix by adding or
moving a const qualifier or removing an unnecessary cast.  There are
many more complicated cases remaining.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/1b81c2fe6ee2b26d37610c3d381a87fa17af0a7c

Modified Files
--------------
contrib/btree_gist/btree_cash.c                 |   14 +++++++-------
contrib/btree_gist/btree_date.c                 |   14 +++++++-------
contrib/btree_gist/btree_float4.c               |   14 +++++++-------
contrib/btree_gist/btree_float8.c               |   14 +++++++-------
contrib/btree_gist/btree_inet.c                 |   14 +++++++-------
contrib/btree_gist/btree_int2.c                 |   14 +++++++-------
contrib/btree_gist/btree_int4.c                 |   14 +++++++-------
contrib/btree_gist/btree_int8.c                 |   14 +++++++-------
contrib/btree_gist/btree_interval.c             |    6 +++---
contrib/btree_gist/btree_macaddr.c              |    4 ++--
contrib/btree_gist/btree_oid.c                  |   14 +++++++-------
contrib/btree_gist/btree_time.c                 |    4 ++--
contrib/btree_gist/btree_ts.c                   |    4 ++--
contrib/dict_xsyn/dict_xsyn.c                   |    2 +-
contrib/hstore/hstore_gist.c                    |    2 +-
contrib/hstore/hstore_io.c                      |   15 ++++++++-------
contrib/intarray/_int_gist.c                    |    4 ++--
contrib/intarray/_int_tool.c                    |    8 ++++----
contrib/ltree/_ltree_gist.c                     |    2 +-
contrib/pg_stat_statements/pg_stat_statements.c |    4 ++--
contrib/pg_trgm/trgm.h                          |    2 +-
contrib/pg_trgm/trgm_gist.c                     |    4 ++--
contrib/pgcrypto/crypt-blowfish.c               |    6 +++---
contrib/pgcrypto/crypt-des.c                    |    4 ++--
contrib/pgcrypto/crypt-gensalt.c                |    6 +++---
contrib/pgcrypto/crypt-md5.c                    |   20 ++++++++++----------
src/backend/commands/analyze.c                  |   16 ++++++++--------
src/backend/commands/copy.c                     |    8 ++++----
src/backend/libpq/ip.c                          |   12 ++++++------
src/backend/libpq/md5.c                         |    8 ++++----
src/backend/nodes/makefuncs.c                   |    2 +-
src/backend/nodes/tidbitmap.c                   |    4 ++--
src/backend/postmaster/autovacuum.c             |    4 ++--
src/backend/storage/lmgr/lock.c                 |    6 +++---
src/backend/tsearch/dict_synonym.c              |    2 +-
src/backend/tsearch/dict_thesaurus.c            |    8 ++++----
src/backend/tsearch/spell.c                     |    8 ++++----
src/backend/tsearch/to_tsany.c                  |    8 ++++----
src/backend/tsearch/ts_utils.c                  |    2 +-
src/backend/utils/adt/tsgistidx.c               |    8 ++++----
src/backend/utils/adt/tsquery_gist.c            |    4 ++--
src/backend/utils/adt/tsrank.c                  |    8 ++++----
src/backend/utils/adt/xml.c                     |    4 ++--
src/backend/utils/mb/conv.c                     |   20 ++++++++++----------
src/bin/pg_dump/common.c                        |    4 ++--
src/bin/pg_dump/pg_backup_archiver.c            |    4 ++--
src/bin/pg_dump/pg_backup_files.c               |    2 +-
src/bin/pg_dump/pg_backup_tar.c                 |    6 +++---
src/bin/pg_dump/pg_dump_sort.c                  |   12 ++++++------
src/bin/psql/mbprint.c                          |    4 ++--
src/bin/psql/mbprint.h                          |    4 ++--
src/bin/psql/print.c                            |   20 ++++++++++----------
src/include/nodes/makefuncs.h                   |    2 +-
src/interfaces/ecpg/ecpglib/descriptor.c        |   20 ++++++++++----------
src/interfaces/ecpg/ecpglib/execute.c           |    4 ++--
55 files changed, 219 insertions(+), 218 deletions(-)