bsps/sparc: Move gnatsupp to bsps

This patch is a part of the BSP source reorganization.

Update #3285.

bsps/sparc/leon2/gnatsupp/gnatsupp.c

@@ -0,0 +1,30 @@
+/**
+ * @file
+ *
+ * @ingroup sparc_leon2
+ *
+ * @brief Support for gnat/rtems iterrupts and exception handling
+ */
+
+/*
+ * COPYRIGHT (c) 1999.
+ * European Space Agency.
+ *
+ * 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.
+ *
+ */
+
+#include <bsp/gnatcommon.h>
+
+/*
+ *  Avoid trap 0x18 which is used by the clock tick, and
+ *  0x12 (UART B interrupt) which is used by the stub.
+ */
+
+void
+__gnat_install_handler (void)
+{
+  __gnat_install_handler_common (0x18, 0x12);
+}