Patch merged into coreboot/master: crossgcc/buildgcc: Add comment about URLs and jenkins builder

the following patch was just integrated into master:
commit 1484c03916ec7672a053f04bf0b53741189bf649
Author: Martin Roth 
Date:   Tue Mar 8 09:37:14 2016 -0700

crossgcc/buildgcc: Add comment about URLs and jenkins builder

Add a comment to try to lower possible confusion later if the jenkins
    tool builder fails to build a new tool.  The URLs for the packages that
    are downloaded are checked against known locations so that someone can't
    maliciously download a package from somewhere and run it on the build
    server.  This provides a little bit of security, but could confuse
    someone if they don't realize it.

Change-Id: I7858e3d86fc705b480f6792b6adf3d5349580e01
    Signed-off-by: Martin Roth 
    Reviewed-on: https://review.coreboot.org/13955
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer 
    Reviewed-by: Paul Menzel

See https://review.coreboot.org/13955 for details.

-gerrit