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
------
REL8_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/8607099a19066927b1c2ee6311a8cf0a64192e07

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

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