pgsql: Accept flex > 2.5.x on Windows, too.

Accept flex > 2.5.x on Windows, too.

Commit 32f15d05c fixed this in configure, but missed the similar check
in the MSVC scripts.

Michael Paquier, per report from Victor Wagner

Branch
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REL9_3_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/b3e377a004511df45dcd6bc58353ce1f44932433

Modified Files
--------------
src/tools/msvc/pgflex.pl | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

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