tests2: move into tests

tests/tests2/18_include.c

@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+int main()
+{
+   printf("including\n");
+#include "18_include.h"
+   printf("done\n");
+
+   return 0;
+}
+
+/* vim: set expandtab ts=4 sw=3 sts=3 tw=80 :*/