dev-db/postgresql: drop old Perl workaround

The code being removed here can't work with modern Perl:
```
$ perl -e 'use utf8; use re; package utf8; require "utf8_heavy.pl";';
Can't locate utf8_heavy.pl in @INC (@INC entries checked: /etc/perl /usr/local/lib64/perl5/5.38/x86_64-linux /usr/local/lib64/perl5/5.38 /usr/lib64/perl5/vendor_perl/5.38/x86_64-linux /usr/lib64/perl5/vendor_perl/5.38 /usr/lib64/perl5/5.38/x86_64-linux /usr/lib64/perl5/5.38) at -e line 1.
```

The original reporter of the bug it was added for (bug #518522) was Chris Mayo
who can't reproduce the original problem. Given it now actively causes an issue,
let's drop it, and not worry about replacing it with something else right now -
it's unclear anything is needed now.

This still leaves pollution in postgresql.conf - which I leave to the pgsql
maintainers to resolve, but at least we're not adding it for new installs now.

Note that it's likely https://bugs.gentoo.org/518522#c6 was still an issue
and this will be resolved now too.

Bug: https://bugs.gentoo.org/518522
Bug: https://bugs.gentoo.org/792537
Signed-off-by: Sam James <sam@gentoo.org>

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