Patch merged into coreboot/master: Revert "util/crossgcc: Build Ada frontend by default"

the following patch was just integrated into master:
commit 32c4a06a43dd2b61b589e7f9c10f44c1902d7447
Author: Nico Huber 
Date:   Mon Jan 25 18:30:57 2016 +0100

Revert "util/crossgcc: Build Ada frontend by default"

This reverts commit 89798bcb0cee369cd2aaeda8704d23d347dbe192.

Disable building gnat again as it turned out that many distros don't
    ship with a sufficient recent version of gnat. We'll have to find a
    reliable way to check for the installed gnat version and query the
    user or bootstrap gcc in that case.

Change-Id: Ife7cf7c9d1567aca898ce308b120a7b9e146e5f5
    Signed-off-by: Nico Huber 
    Reviewed-on: https://review.coreboot.org/13422
    Reviewed-by: Patrick Georgi 
    Reviewed-by: Martin Roth 
    Reviewed-by: Timothy Pearson 
    Tested-by: build bot (Jenkins)

See https://review.coreboot.org/13422 for details.

-gerrit