bug#43050: 28.0.50; portable dump file name should respect program-prefix config option

[Eli Zaretskii]

> Date: Tue, 25 Aug 2020 13:24:40 -0700 (PDT)
> From: "T.V Raman" via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> If you configure emacs with the --program-prefix option,
> e.g. --program-prefix=native- when building emacs with gccjit support,
> the portable dumper file   continues to be named emacs.pdmp, thus
> making it impossible to install  both a regular emacs build  and one
> with native-comp support.
> 
> An easy fix would be for the portable dumper file name to respect
> program-prefix 

This is already supported.  The only thing that's missing, AFAICT, is
that "make install" should apply the prefix to the dumper file name.
But if you rename the dumper file manually in the same directory where
it is installed, it should work.