iprutils: use correct include path for ncurses

The Makefile is hardcoded for /usr/include/ncurses, so override it.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Reported-by: Romain Naour <romain.naour@openwide.fr>

package/iprutils/iprutils.mk

@@ -12,7 +12,8 @@ IPRUTILS_LICENSE = Common Public License Version 1.0
 IPRUTILS_LICENSE_FILES = LICENSE
 
 define IPRUTILS_BUILD_CMDS
-	$(MAKE) $(TARGET_CONFIGURE_OPTS) -C $(@D) all
+	$(MAKE) $(TARGET_CONFIGURE_OPTS) -C $(@D) \
+		INCLUDEDIR="-I. $(shell $(STAGING_DIR)/usr/bin/ncurses5-config --cflags)" all
 endef
 
 define IPRUTILS_INSTALL_TARGET_CMDS