bug#47558: 28.0.50; dlopen 'image not found' gccemacs native-lisp macos

[Eli Zaretskii]

> Date: Wed, 7 Apr 2021 10:58:09 +0100
> From: Alan Third <alan@idiocy.org>
> Cc: Eli Zaretskii <eliz@gnu.org>, bryan.m.obrien@gmail.com,
>       47558@debbugs.gnu.org
> 
> This appears to work, but I don't see anything else like it in
> configure.ac, so it's maybe not a good idea:
> 
>         brew_libdir=`dirname ${BREW_LIBGCCJIT_PREFIX}/lib/gcc/*/libgccjit.so`
>         LDFLAGS="$LDFLAGS -L${brew_libdir} -I${BREW_LIBGCCJIT_PREFIX}/include"

This is indeed non-portable, but using 'find' pipes into a suitable
Sed script should be able to do that portably.

It is indeed suboptimal to have the compiler version in these file
names, so I'd prefer to solve it in a cleaner way.