[syslinux] [PATCH] Fix recognition of keeppxe option

[Ady Ady]

> Pushed.  Thank you for digging so deeply on this.
> 
 
Gene,

For the c32 modules to be able to use the keeppxe option, and 
considering that the issue in v.5.+ is that 'IS_PXELINUX' is/was dead 
code, is there any chance that the code in:
com32/modules/whichsys.c
would help?

I mean, as a different way of detecting the Syslinux variant.

In fact, the original idea of having the code in whichsys.c librarized 
is probably still relevant.

TIA,
Ady.