Patch merged into coreboot/master: buildgcc: Add check for missing libraries and test for zlib

the following patch was just integrated into master:
commit 591790fca5f3e2ce0b1e4fa6099f59aaf9546c95
Author: Martin Roth 
Date:   Sun Mar 20 20:39:04 2016 -0600

buildgcc: Add check for missing libraries and test for zlib

- Add check_for_library routine to test for missing libraries.
    - Add a check for zlib.
    - Remove 'utility' text from please_install() routine since we can test
    for libraries or utilities now.
    - Remove incorrect 'solution' text from alternate install since I was
    updating that line.

Change-Id: Id5ef28f8bde114cbf4e5a91fc119d42593ea6ab2
    Signed-off-by: Martin Roth 
    Reviewed-on: https://review.coreboot.org/14147
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See https://review.coreboot.org/14147 for details.

-gerrit