+lua/dyn does not work on Cygwin

[Ken Takata]

Hi,

I found that +lua/dyn does not work on Cygwin.
When +lua/dyn is specified on Cygwin, Vim tries to load liblua.so.
However the actual name of the DLL is cyglua-5.1.dll.

Attached patch fixes this problem.

Best regards,
Ken Takata

[Bram Moolenaar]

Ken Takata wrote:

> I found that +lua/dyn does not work on Cygwin.
> When +lua/dyn is specified on Cygwin, Vim tries to load liblua.so.
> However the actual name of the DLL is cyglua-5.1.dll.
>
> Attached patch fixes this problem.

Thanks. I'm not 100% sure this works properly in every possible
situation, best way is to include it and wait until someone complains...

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