util-linux-ng: fix broken symlinks

* # opkg files util-linux-ng | grep 'halt\|boot' | xargs file
/usr/sbin/fastboot:             broken symbolic link to `/usr/sbin/shutdown'
/usr/sbin/halt:                 broken symbolic link to `shutdown'
/usr/sbin/halt.util-linux-ng:   broken symbolic link to `/usr/sbin/shutdown'
/usr/sbin/fasthalt:             broken symbolic link to `/usr/sbin/shutdown'
/usr/sbin/reboot:               broken symbolic link to `shutdown'
/usr/sbin/reboot.util-linux-ng: broken symbolic link to `/usr/sbin/shutdown'

* this patch close bug 5475
http://bugs.openembedded.org/show_bug.cgi?id=5475

From: Korey Lu <koreylu@gmail.com>
Signed-off-by: Eric Bénard <eric@eukrea.com>

recipes/util-linux-ng/util-linux-ng.inc

@@ -176,10 +176,10 @@ do_install () {
 
 	rm ${D}${sbindir}/swapoff -f
 	ln -sf ${base_sbindir}/swapon.${PN} ${D}${base_sbindir}/swapoff.${PN}
-	ln -sf ${sbindir}/shutdown ${D}${sbindir}/reboot.${PN}
-	ln -sf ${sbindir}/shutdown ${D}${sbindir}/halt.${PN}
-	ln -sf ${sbindir}/shutdown ${D}${sbindir}/fastboot
-	ln -sf ${sbindir}/shutdown ${D}${sbindir}/fasthalt
+	ln -sf ${base_sbindir}/shutdown ${D}${base_sbindir}/reboot.${PN}
+	ln -sf ${base_sbindir}/shutdown ${D}${base_sbindir}/halt.${PN}
+	ln -sf ${base_sbindir}/shutdown ${D}${base_sbindir}/fastboot
+	ln -sf ${base_sbindir}/shutdown ${D}${base_sbindir}/fasthalt
 }
 
 python populate_packages_prepend () {