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
------
REL9_1_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/8bd328eaee0b3a9d96e5e2f0f6a420ffe05bf4d2

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

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