pgsql: Allow binary I/O of type "void".

Allow binary I/O of type "void".

void_send is useful for the same reason that void_out doesn't throw error,
namely that someone might do "select void_returning_func(...)" from a
client that prefers to operate in binary mode. The void_recv function may
or may not have any practical use, but we provide it for symmetry.

Radosław Smogura

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/1ab9b012bdf1f106792fc523e21b9ca8299bb8ed

Modified Files
--------------
src/backend/utils/adt/pseudotypes.c | 28 ++++++++++++++++++++++++++++
src/include/catalog/catversion.h | 2 +-
src/include/catalog/pg_proc.h | 4 ++++
src/include/catalog/pg_type.h | 2 +-
src/include/utils/builtins.h | 2 ++
5 files changed, 36 insertions(+), 2 deletions(-)