pgsql: PL/Perl portability fix: absorb relevant -D switches from Perl.

PL/Perl portability fix: absorb relevant -D switches from Perl.

Back-patch of commit 3c163a7fc76debbbdad1bdd3c43721cffe72f4db,
which see for more info.

Also throw in commit b4cc35fbb709bd6fcae8998f041fd731c9acbf42,
so Coverity doesn't whine about the back branches.

Ashutosh Sharma, some adjustments by me

Discussion: /messages/by-id/CANFyU97OVQ3+Mzfmt3MhuUm5NwPU=-FtbNH5Eb7nZL9ua8=rcA@mail.gmail.com

Branch
------
REL9_6_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/1e58c503ec46ec78ddf19aa5bad7d095f14e042b

Modified Files
--------------
config/perl.m4 | 25 +++++++++++++++++++++++++
configure | 13 +++++++++++++
configure.in | 1 +
contrib/hstore_plperl/Makefile | 2 +-
src/Makefile.global.in | 1 +
src/pl/plperl/GNUmakefile | 6 +++++-
src/pl/plperl/plperl.c | 28 +++++++++++++++++-----------
src/tools/msvc/Mkvcbuild.pm | 27 +++++++++++++++++++++++++--
8 files changed, 88 insertions(+), 15 deletions(-)

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