Handle os-release more smartly

The Qt ports, and GNOME control center, can read /etc/os-release,
and have patches to read /usr/local/etc/os-release -- however,
the two files update differently, and /etc/os-release is preferred.
Tighten up the .if to select when to depend on the extra
port for /usr/local/etc/os-release (basically: pre 11.4 and 12.1)

- Bumps PORTREVISION because dependencies may change.
- Note that I used the --author command-line option to
  set that mikael@ wrote this patch.

PR:		251073

devel/qt5-core/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	core
 DISTVERSION=	${QT5_VERSION}
-PORTREVISION=	3
+PORTREVISION=	4
 CATEGORIES=	devel
 PKGNAMEPREFIX=	qt5-
 
@@ -39,9 +39,7 @@ QT_CONFIG=	glib icu
 MORE_WRKSRCS=	src/tools/bootstrap src/corelib src/tools/qlalr
 
 .include <bsd.port.pre.mk>
-# FreeBSD base gained /etc/os-release in r354922, which
-# corresponds to __FreeBSD_version 1300060
-.if ${OSVERSION} < 1300060
+.if !exists(/etc/rc.d/os-release)
 RUN_DEPENDS+=	etc_os-release>0:sysutils/etc_os-release
 post-patch:
 	${REINPLACE_CMD}  -e '/readEtcFile/s|/etc/os-release|${LOCALBASE}/etc/os-release|g' \

sysutils/gnome-control-center/Makefile

@@ -2,6 +2,7 @@
 
 PORTNAME=	gnome-control-center
 PORTVERSION=	3.38.3
+PORTREVISION=	1
 CATEGORIES=	sysutils gnome
 MASTER_SITES=	GNOME
 DIST_SUBDIR=	gnome
@@ -72,9 +73,7 @@ LDFLAGS+=      -fuse-ld=lld
 .endif
 
 .include <bsd.port.pre.mk>
-# FreeBSD base gained /etc/os-release in r354922, which
-# corresponds to __FreeBSD_version 1300060
-.if ${OSVERSION} < 1300060
+.if !exists(/etc/rc.d/os-release)
 RUN_DEPENDS+=	etc_os-release>0:sysutils/etc_os-release
 post-patch:
 	@${REINPLACE_CMD}  -e 's|/etc/os-release|${LOCALBASE}/etc/os-release|g' \