Move the db_test.c to a specific test directory
diff --git a/tests/Makefile.am b/tests/Makefile.am
index fbfc827..2b72c9c 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -1 +1 @@
-SUBDIRS = debug timer sms gsm0408
+SUBDIRS = debug timer sms gsm0408 db