Enhancement to hideif.el

[Joe Matarazzo]

Hi,

I added an enhancement to hideif.el, based on the 22.3.1 windows
distribution of Emacs, to recognize  the #elif preprocessor directive.
I would like to contribute this improvement for future distributions.
I tried contacting the listed maintainer of this library, Daniel
LaLiberte (address@hidden), but didn't receive a response.

Is there someone else I should follow up with to review these changes,
and potentially get them incorporated?

Thanks,
Joe