please update flexdll from 0.25 to 0.26

[Damien Doligez]

Hello,

There is a problem with flexdll version 0.25 under (at least) Windows 7 :
the OCaml debugger fails as soon as it tries to run the program (with
fork() being unable to remap a shared lib).

I don't have the problem with the latest upstream version (flexdll 0.26),
so it would be great if Yaakov could update to the new version.

Thanks,

-- Damien