pgsql: Avoid "variable might be clobbered by longjmp" warning.

Avoid "variable might be clobbered by longjmp" warning.

On older-model gcc, the original coding of UTILITY_BEGIN_QUERY() can
draw this error because of multiple assignments to _needCleanup.
Rather than mark that variable volatile, we can suppress the warning
by arranging to have just one unconditional assignment before PG_TRY.

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/58bc48179b3cad0793ae20b002d60289c8bf0b9b

Modified Files
--------------
src/backend/tcop/utility.c | 7 ++-----
1 files changed, 2 insertions(+), 5 deletions(-)

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