Add toplevel recursive check-valgrind rule

* Makefile.am (.PHONY): Add check-valgrind-local.
(check-valgrind): New rule.
* configure.ac (AM_EXTRA_RECURSIVE_TARGETS): Add it.

Makefile.am

@@ -753,6 +753,9 @@ EXTRA_DIST =				\
 	xlat/gen.sh			\
 	xlate.el
 
+.PHONY: check-valgrind-local
+check-valgrind-local:
+
 .PHONY: srpm
 srpm: dist-xz
 	rpmbuild --define '%_srcrpmdir .' -ts $(distdir).tar.xz

configure.ac

@@ -37,6 +37,7 @@ AC_CONFIG_SRCDIR([strace.c])
 AC_CONFIG_AUX_DIR([.])
 AC_CONFIG_HEADERS([config.h])
 AM_INIT_AUTOMAKE([foreign nostdinc dist-xz silent-rules parallel-tests])
+AM_EXTRA_RECURSIVE_TARGETS([check-valgrind])
 AM_MAINTAINER_MODE
 AC_CANONICAL_HOST