Tell autocrap about compat/execinfo.h

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@4059 d4fa192b-c00b-0410-8231-f00ffab90ce4

include/Makefile.am

@@ -14,6 +14,7 @@ nobase_noinst_HEADERS = \
 	cli_priv.h \
 	compat/asprintf.h \
 	compat/daemon.h \
+	compat/execinfo.h \
 	compat/setproctitle.h \
 	compat/srandomdev.h \
 	compat/strlcat.h \