util/crossgcc: Document how to build the toolchain for another location

One common issue with the toolchain is that it takes a very long time
to build while it's somewhat volatile inside the coreboot tree.

Installing the toolchain elsewhere helps keep it safe but since there
is no reliable default location outside the tree, keep the default
as is.

Change-Id: Ic414cddfd3c7097412f3f2c3c7ec7b7191fa32de
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/29826
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

0 files changed, 0 insertions, 0 deletions