pgsql: Accept flex > 2.5.x in configure.

Accept flex > 2.5.x in configure.

Per buildfarm member anchovy, 2.6.0 exists in the wild now.
Hopefully it works with Postgres; if not, we'll have to do something
about that, but in any case claiming it's "too old" is pretty silly.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/32f15d05c80044335f97347b5406f6736c06a033

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

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