pgsql: Accept tcl 8.6 in configure's probe for tclsh.

Accept tcl 8.6 in configure's probe for tclsh.

Usually the search would find plain "tclsh" without any trouble,
but some installations might only have the version-numbered flavor
of that program.

No compatibility problems have been reported with 8.6, so we might
as well back-patch this to all active branches.

Christoph Berg

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/eaba54c20c5ab2cb6aaffa574444fd4990dfe2c7

Modified Files
--------------
config/tcl.m4 | 2 +-
configure | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

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