open-iscsi: fix compilation when openslp is installed.

Two main issues:
1. open-iscsi build system, inside Makefile, user target, calls
   ./configure (which is very bad itself) without letting to choose
   configure options. Fixed in:
   open-iscsi-2.0.872-omg-calling-configure.patch
2. when openslp support is automagically enabled, -lslp didn't get
   added to compiler arguments. Fixed in:
   open-iscsi-2.0.872-slp.patch

Peace.

gen_compile.sh

@@ -685,8 +685,13 @@ compile_iscsi() {
 			gen_die "ISCSI directory ${ISCSI_DIR} invalid"
 				print_info 1 'iSCSI: >> Compiling...'
 		cd "${TEMP}/${ISCSI_DIR}"
+		apply_patches iscsi ${ISCSI_VER}
 
 		# Only build userspace
+		print_info 1 'iSCSI: >> Configuring userspace...'
+		cd utils/open-isns || gen_die 'Could not enter open-isns dir'
+		./configure --without-slp >> ${LOGFILE} 2>&1 || gen_die 'Could not configure userspace'
+		cd ../.. || gen_die 'wtf?'
 		MAKE=${UTILS_MAKE} compile_generic "user" ""
 
 		# if kernel modules exist, copy them to initramfs, otherwise it will be compiled into the kernel

patches/iscsi/2.0-872/open-iscsi-2.0.872-omg-calling-configure.patch

@@ -0,0 +1,11 @@
+--- open-iscsi-2.0-872.orig/Makefile
++++ open-iscsi-2.0-872/Makefile
+@@ -27,7 +27,7 @@ IFACEFILES = etc/iface.example
+ all: user kernel
+ 
+ user: ;
+-	cd utils/open-isns; ./configure; $(MAKE)
++	cd utils/open-isns; $(MAKE)
+ 	$(MAKE) -C utils/sysdeps
+ 	$(MAKE) -C utils/fwparam_ibft
+ 	$(MAKE) -C usr

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

@@ -0,0 +1,11 @@
+--- open-iscsi-2.0-872.orig/utils/open-isns/configure.ac
++++ open-iscsi-2.0-872/utils/open-isns/configure.ac
+@@ -79,7 +79,7 @@ AC_ARG_WITH(slp,
+ 			WITH_SLP=$withval
+ 		else
+ 			WITH_SLP=yes
+-			CPPFLAGS="$CPPFLAGS -I${withval}"
++			CPPFLAGS="$CPPFLAGS -I${withval} -lslp"
+ 			LDFLAGS="$LDFLAGS -L${withval}"
+ 		fi
+ 	]