Patch merged into coreboot/master: buildgcc: Build GMP `--with-pic` if GCC defaults to `-pie`

the following patch was just integrated into master:
commit 8bbd596de631adc8b677e69603e978b848eb1708
Author: Nico Huber 
Date:   Thu Dec 22 16:05:54 2016 +0100

buildgcc: Build GMP `--with-pic` if GCC defaults to `-pie`

GCC 6 can optionally default to building all binaries as position
    independent executables (PIE). This breaks linking against static
    libraries that are compiled without position independent code (PIC).

Building GMP `--with-pic` in this case seems to be the least fragile
    solution.

TEST=Run `make all` and `make BUILDGCC_OPTIONS=-b build-i386` in
         util/crossgcc on Debian Stretch.

Change-Id: I5f3185af9c8d599379a628e18724b217b88be974
    Signed-off-by: Nico Huber 
    Reviewed-on: https://review.coreboot.org/17936
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Jonathan Neuschäfer

See https://review.coreboot.org/17936 for details.

-gerrit