Patch merged into coreboot/master: .gitignore: add output files for various make targets

the following patch was just integrated into master:
commit 69759401db27add72bd76251e9365d6fa1fa4172
Author: Martin Roth 
Date:   Mon Nov 23 08:41:57 2015 -0700

.gitignore: add output files for various make targets

- Ignore output files for the new utilities amdfwtool and intelvbttool
    - Ignore xml files for 'make what-jenkins-does'
    - Ignore build files from libpayload's 'make install'

Change-Id: Ie4f1c9bf7dc597f7600c8bda0c6fad5f40acf7f8
    Signed-off-by: Martin Roth 
    Reviewed-on: https://review.coreboot.org/12512
    Tested-by: build bot (Jenkins)
    Reviewed-by: Patrick Georgi 
    Reviewed-by: Stefan Reinauer

See https://review.coreboot.org/12512 for details.

-gerrit