pgsql: Fix C++ incompatibilities in plpgsql's header files.

Fix C++ incompatibilities in plpgsql's header files.

Rename some exposed parameters so that they don't conflict with
C++ reserved words.

Back-patch to all supported versions.

George Tarasov

Discussion: /messages/by-id/b517ec3918d645eb950505eac8dd434e@gaz-is.ru

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/3f61b3205f1a8bd27909be97341f002db8842093

Modified Files
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src/pl/plpgsql/src/pl_comp.c | 6 +++---
src/pl/plpgsql/src/pl_exec.c | 22 +++++++++++-----------
src/pl/plpgsql/src/plpgsql.h | 5 +++--
3 files changed, 17 insertions(+), 16 deletions(-)