Remove patch on -lspl as our --without-slp seems to take another branch in configure, anyway

patches/iscsi/2.0-872/open-iscsi-2.0.872-slp.patch

@@ -1,11 +0,0 @@
---- a/utils/open-isns/configure.ac
-+++ b/utils/open-isns/configure.ac
-@@ -80,7 +80,7 @@ AC_ARG_WITH(slp,
- 		else
- 			WITH_SLP=yes
- 			CPPFLAGS="$CPPFLAGS -I${withval}"
--			LDFLAGS="$LDFLAGS -L${withval}"
-+			LDFLAGS="$LDFLAGS -L${withval} -lslp"
- 		fi
- 	]
- )