pgsql: Fix erroneous parsing of tsquery input "... & !(subexpression) |

Fix erroneous parsing of tsquery input "... & !(subexpression) | ..."

After parsing a parenthesized subexpression, we must pop all pending
ANDs and NOTs off the stack, just like the case for a simple operand.
Per bug #5793.

Also fix clones of this routine in contrib/intarray and contrib/ltree,
where input of types query_int and ltxtquery had the same problem.

Back-patch to all supported versions.

Branch
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REL8_3_STABLE

Details
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http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=d9b99b4b60fd0925b9e223ec9f5ea275a8c2dde5

Modified Files
--------------
contrib/intarray/_int_bool.c | 4 ++--
contrib/ltree/ltxtquery_io.c | 4 ++--
src/backend/utils/adt/tsquery.c | 4 ++--
3 files changed, 6 insertions(+), 6 deletions(-)