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.

graphics/p5-PerlMagick/Makefile

@@ -1,5 +1,6 @@
-# $NetBSD: Makefile,v 1.169 2021/12/12 09:38:04 wiz Exp $
+# $NetBSD: Makefile,v 1.170 2021/12/17 11:57:58 schmonz Exp $
 
+PKGREVISION=	1
 .include "../../graphics/ImageMagick/Makefile.common"
 
 PKGNAME=	p5-PerlMagick-${DISTVERSION}
@@ -16,6 +17,7 @@ CONFIGURE_ARGS+=	--with-perl=${PERL5:Q}
 
 PERL5_CONFIGURE=	no
 PERL5_CONFIGURE_DIRS=	${WRKSRC}/PerlMagick
+PERL5_LDFLAGS=		-lMagickCore-7.Q16HDRI
 PERL5_PACKLIST=		auto/Image/Magick/.packlist
 BUILD_DIRS=		${PERL5_CONFIGURE_DIRS}