Fix 'make distclean' for tests directory

Change-Id: Ieea89604ca6857c8385466a7a0d6c26d1880f95f

Makefile.am

@@ -1,7 +1,7 @@
 AUTOMAKE_OPTIONS = foreign dist-bzip2 1.6
 
 AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
-SUBDIRS = src contrib
+SUBDIRS = src tests contrib
 
 EXTRA_DIST = .version git-version-gen doc/examples/osmo-cbc.cfg
 

configure.ac

@@ -167,5 +167,6 @@ AC_MSG_RESULT([CPPFLAGS="$CPPFLAGS"])
 AC_OUTPUT(
     src/Makefile
     contrib/Makefile
+    tests/Makefile
     contrib/systemd/Makefile
     Makefile)

tests/Makefile.am

@@ -0,0 +1,5 @@
+
+
+DISTCLEANFILES = \
+	atconfig \
+	$(NULL)