bug#57677: GIMP retains reference to GCC

["宋文武 via Bug reports for GNU Guix" <bug-guix@gnu.org>]

Ludovic Courtès <ludo@gnu.org> writes:

> [...]
> So the root cause is that GIMP’s build process captures the output of
> ‘gcc -v’, which leads to this unintended retention.

I sent a patch to fix reference from 'gcc -v', but gcc is still here via
exiv2->gcc:

rg -a /gnu/store/069aq2v993kpc41yabp5b6vm4wb9jkhg-gcc-10.3.0 $(guix build exiv2)

--8<---------------cut here---------------start------------->8---
bin/iptcprint:^@^@^@std::auto_ptr< <template-parameter-1-1> >::element_type* std::auto_ptr< <template-parameter-1-1> >::operator->() const [with _T
p = Exiv2::Image; std::auto_ptr< <template-parameter-1-1>>::element_type =
Exiv2::Image]^@^@^@^@^@^@^@^@/gnu/store/069aq2v993kpc41yabp5b6vm4wb9jkhg-gcc-10.3.0/include/c++/backward/auto_ptr.h^@^@%s:%d:
%s: Assertion '%s' failed.
[...]
--8<---------------cut here---------------end--------------->8---