configure: Add "subdir-objects" automake option

Automake now warns that it will be the only behavior
in the future. So quell the warning by adding it.

diff --git a/configure.ac b/configure.ac
index 2826022..9194507 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -12,7 +12,7 @@ AC_CANONICAL_TARGET
 
 AC_CONFIG_SRCDIR([agent/agent.c])
 AC_CONFIG_HEADERS([config.h])
-AM_INIT_AUTOMAKE([1.12 -Wall -Wno-portability])
+AM_INIT_AUTOMAKE([1.12 -Wall -Wno-portability subdir-objects])
 
 AC_CONFIG_FILES([
        Makefile