loader: libofw build is missing sys/list.h after r362431

Add another include path

stand/libofw/Makefile

@@ -10,6 +10,7 @@ SRCS=	devicename.c ofw_console.c ofw_copy.c ofw_disk.c \
 .PATH:	${ZFSSRC}
 SRCS+=  devicename_stubs.c
 CFLAGS+=	-I${ZFSSRC} -I${SYSDIR}/cddl/boot/zfs
+CFLAGS+=	-I${SYSDIR}/cddl/contrib/opensolaris/uts/common
 
 # Pick up the bootstrap header for some interface items
 CFLAGS+=	-I${LDRSRC}