Added dummy gnatinstallhandler code for all BSPs. This lets Ada programs

link even if they do not actually support Ada interrupts.

c/src/lib/libbsp/shared/gnatinstallhandler.c

@@ -0,0 +1,17 @@
+/*
+ *  Default implementation of __gnat_install_handler to satisfy 
+ *  reference in a-init.c in GNAT's run-time.  Each BSP really
+ *  should provide its own version of this routine but this
+ *  version lets programs link.
+ *
+ *  This routine is responsible for installing fault/exception/trap
+ *  handlers that map them onto POSIX signals so they can be 
+ *  propagated to the GNAT run-time.  See the sparc/erc32 BSP
+ *  for an example.
+ *
+ *  $Id$
+ */
+
+void __gnat_install_handler( void )
+{
+}