Arch-specific build tool formulae (https://github.com/Homebrew/homebrew-core/pull/79874) install their info files in `#{info}/<arch>` to avoid conflicts with the main tool formulae.
However, the info cleaner only removes `#{info}/dir`, so each tool's bottle includes `#{info}/<arch>/dir`, which causes install-time conflicts.
This PR fixes that by deleting all `dir`s under `#{info}`.
Before:
```
==> Cleaning
[...]
==> Fixing /usr/local/Cellar/i686-elf-binutils/2.36.1_1/lib/i686-elf/bfd-plugins/libdep.so permissions from 755 to 444
==> Finishing up
```
After:
```
==> Cleaning
[...]
==> Fixing /usr/local/Cellar/i686-elf-binutils/2.36.1_1/lib/i686-elf/bfd-plugins/libdep.so permissions from 755 to 444
rm /usr/local/Cellar/i686-elf-binutils/2.36.1_1/share/info/i686-elf/dir
==> Finishing up
```
We shouldn't be packaging either `perllocal.pod` or `.packlist` files. Both
are only really useful outside of package management. They get automatically
generated whenever you install a Perl module.
Debian, Arch, MacPorts & others remove them and we should have been as well
really; keeping them causes completely unnecessary conflicts between formulae.
Don't unset things that are already set as executable for the generic path.
OS X overrides this behaviour and detects if it's an MachO executable but
there's no cross-OS generic equivalent so just fall back to whatever the build
system has set.
The cleaning step changes permissions on files. Added a commented-out block
that will show permission changes when doing verbose builds.
Since this output is not generally useful for even normal verbose builds,
added as commented-out code (I'm sorry) so that maintainers can uncomment
it when this functionality is needed for debugging.
