Makefile: Add support to bind/link application binaries

Since Ada supports different names for the Main() procedure, we have to
specify the main source file explicitly. Also, the binder (gnatbind)
insists on searching the required object files himself, so we only spe-
cify the object file of the main procedure.

Change-Id: I7227b845e38963e5434a4db0068d373fc4b7ee99
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/18781
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
1 file changed