virtual_oss: Do not build if WITHOUT_CUSE is set

PR:		289920
Fixes:          9cab9fde5e ("virtual_oss: Port to base")
Sponsored by:	The FreeBSD Foundation
MFC after:	1 day
Reviewed by:	emaste
Differential Revision:	https://reviews.freebsd.org/D52807

libexec/rc/rc.d/Makefile

@@ -75,7 +75,6 @@ CONFS=	DAEMON \
 	ugidfw \
 	var \
 	var_run \
-	virtual_oss \
 	watchdogd
 
 CONFGROUPS+=		DEVD
@@ -216,6 +215,12 @@ CCD=		ccd
 CCDPACKAGE=	ccdconfig
 .endif
 
+.if ${MK_CUSE} != "no"
+CONFGROUPS+=	VOSS
+VOSS=		virtual_oss
+VOSSPACKAGE=	virtual_oss
+.endif
+
 .if ${MK_KERBEROS_SUPPORT} != "no"
 CONFGROUPS+=	GSSD
 GSSD=		gssd