sysvinint: bump Debian patch

-13 patch no longer available on the Debian mirrors.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/sysvinit/sysvinit.mk

@@ -5,7 +5,7 @@
 #############################################################
 SYSVINIT_VERSION = 2.88
 SYSVINIT_SOURCE  = sysvinit_$(SYSVINIT_VERSION)dsf.orig.tar.gz
-SYSVINIT_PATCH   = sysvinit_$(SYSVINIT_VERSION)dsf-13.diff.gz
+SYSVINIT_PATCH   = sysvinit_$(SYSVINIT_VERSION)dsf-13.1.diff.gz
 SYSVINIT_SITE    = $(BR2_DEBIAN_MIRROR)/debian/pool/main/s/sysvinit
 
 # Override Busybox implementations if Busybox is enabled.