Log Message:
Explicitly pass -lMagickCore-7.Q16HDRI to PERL5_LDFLAGS, which is
redundant-but-harmless for most builds and missing-but-necessary on others.

Already worked, and verified not to change ldd output:
- CentOS 7 and 8
- Debian 9 and 10
- FreeBSD
- NetBSD (9.2 and -current)
- Tribblix

Fixes "undefined symbol: MagickCoreGenesis" thrown by `perl -e 'use
Image::Magick'`:
- Debian 11
- Devuan 4
- Ubuntu 14, 16, 18, 20

Bump PKGREVISION.