build: update gnulib for intprops

Done as a separate commit to make backporting the next patch easier.
We are already using "intprops.h", but this makes it explicit.

* .gnulib: Update, for syntax-check fix.
* bootstrap.conf (gnulib_modules): Make intprops use explicit.
* src/locking/domain_lock.c (includes): Drop unused header.
* src/nwfilter/nwfilter_learnipaddr.c (includes): Use "", not <>,
for gnulib.

bootstrap.conf

@@ -46,6 +46,7 @@ gitlog-to-changelog
 gnumakefile
 ignore-value
 inet_pton
+intprops
 ioctl
 maintainer-makefile
 manywarnings

src/locking/domain_lock.c

@@ -21,8 +21,6 @@
 
 #include <config.h>
 
-#include <intprops.h>
-
 #include "domain_lock.h"
 #include "memory.h"
 #include "uuid.h"

src/nwfilter/nwfilter_learnipaddr.c

@@ -37,10 +37,10 @@
 #include <netinet/ip.h>
 #include <netinet/udp.h>
 #include <net/if_arp.h>
-#include <intprops.h>
 
 #include "internal.h"
 
+#include "intprops.h"
 #include "buf.h"
 #include "memory.h"
 #include "logging.h"