[Patch, committed] Fix bootstrap on freeBSD and hppa64

[Iain Sandoe]

Hi,

I used a non-portable shell idiom in the second patch for pr71767.  This caused 
configuration issues resulting in bootstrap fails for FreeBSD and hppa64-*-*.

Fix tested by Andreas and John (and re-checked on Darwin and Linux by me).

Applied as 242912.
Iain

gcc/

2016-11-28  Iain Sandoe  <i...@codesourcery.com>

        PR target/71767
        * configure.ac (with_ld64): Use portable method to extract the
        major part of the version number.
        * configure: Regenerated.