bug#48246: [PATCH] Prevent unnecessary restarings of ispell program.

[Eli Zaretskii]

> From: Dmitrii Kuragin <dmitriy.kuragin@gmail.com>
> Date: Wed,  5 May 2021 13:29:45 -0700
> Cc: Dmitrii Kuragin <dkuragin@ya.ru>
> 
> From: Dmitrii Kuragin <dkuragin@ya.ru>
> 
> Fix bug when ispell always restarted when `ispell-program-name` has a
> custom value. Function `eq` compares the object identity and not the
> object values which causes `eq` always return `nil` for values with the
> same value but different identity (address). `equal` compares actual
> values.

Thanks, but if we want to be smart about this, why stop at 'equal'?
why not 'file-equal-p'?  The latter will succeed in more cases.