testsuites/ada: Introduce init.c files

Provide an init.c for each Ada test instead of the #include <config.h>
magic which works only due to hand crafted include paths.

Update #3818.

testsuites/ada/samples/base_mp/init.c

@@ -0,0 +1,36 @@
+/*  system.h
+ *
+ *  This include file contains information that is included in every
+ *  function in the test set.
+ *
+ *  COPYRIGHT (c) 1989-1999.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.org/license/LICENSE.
+ */
+
+/* configuration information */
+
+#define CONFIGURE_MP_APPLICATION
+
+#define CONFIGURE_APPLICATION_NEEDS_SIMPLE_CONSOLE_DRIVER
+#define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER
+
+#define CONFIGURE_MAXIMUM_TASKS           2
+
+#define ADA_TEST_NAME "ADA BASE MP"
+
+#define CONFIGURE_POSIX_INIT_THREAD_TABLE
+
+#define CONFIGURE_MAXIMUM_POSIX_THREADS              10
+#define CONFIGURE_MAXIMUM_POSIX_KEYS                 10
+
+/*
+ *  Put the overrides of default configuration parameters here.
+ */
+
+#include "../../support/initimpl.h"
+
+/* end of include file */