Patch merged into coreboot/master: util/crossgcc: Bump MPFR version to 3.1.3

the following patch was just integrated into master:
commit 74432e1b61b66d38be5f8b96c35456f55740b49f
Author: Timothy Pearson 
Date:   Tue Jan 5 10:41:36 2016 -0600

util/crossgcc: Bump MPFR version to 3.1.3

The current MPFR version contains a stale config.guess file
    that requires special handling on ppc64el systems.  Bump
    the MPFR version to the latest release.

Change-Id: I5e86c732c09f8a6a43f9812452124d64d337ea3f
    Signed-off-by: Timothy Pearson 
    Reviewed-on: https://review.coreboot.org/12832
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Patrick Georgi

See https://review.coreboot.org/12832 for details.

-gerrit