This patch is based on https://sources.debian.org/src/isc-kea/1.5.0-2/debian/patches/0005-Put-KEA_LOCKFILE_DIR-to-runstatedir.patch/

We have to modify the autohelled Makefile.in instead of Makefile.am because Kea
requires old automake-1.15.

--- a/src/lib/log/interprocess/Makefile.in
+++ b/src/lib/log/interprocess/Makefile.in
@@ -434,7 +434,7 @@
 top_srcdir = @top_srcdir@
 SUBDIRS = . tests
 AM_CPPFLAGS = -I$(top_srcdir)/src/lib -I$(top_builddir)/src/lib \
-	-DLOCKFILE_DIR=\"$(localstatedir)/run/$(PACKAGE_NAME)\" \
+	-DLOCKFILE_DIR=\"$(runstatedir)/$(PACKAGE_NAME)\" \
 	$(BOOST_INCLUDES)
 AM_CXXFLAGS = $(KEA_CXXFLAGS)
 CLEANFILES = *.gcno *.gcda