pgsql: Dodge a macro-name conflict with Perl.

Dodge a macro-name conflict with Perl.

Some versions of Perl export a macro named HS_KEY. This creates a
conflict in contrib/hstore_plperl against hstore's macro of the same
name. The most future-proof solution seems to be to rename our macro;
I chose HSTORE_KEY. For consistency, rename HS_VAL and related macros
similarly.

Back-patch to 9.5. contrib/hstore_plperl doesn't exist before that
so there is no need to worry about the conflict in older releases.

Per reports from Marco Atzeri and Mike Blackwell.

Branch
------
REL9_5_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/8ee1a776a0c69cbd33b88f1210d1b94dfda18128

Modified Files
--------------
contrib/hstore/hstore.h | 10 +-
contrib/hstore/hstore_compat.c | 2 +-
contrib/hstore/hstore_gin.c | 8 +-
contrib/hstore/hstore_gist.c | 16 ++--
contrib/hstore/hstore_io.c | 83 ++++++++--------
contrib/hstore/hstore_op.c | 148 +++++++++++++++--------------
contrib/hstore_plperl/hstore_plperl.c | 7 +-
contrib/hstore_plpython/hstore_plpython.c | 8 +-
8 files changed, 153 insertions(+), 129 deletions(-)

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