hg: build-infra/jdk9: * Fix clang version detection

[magnus.ihse.bursie at oracle.com]

Changeset: 814a7b7b8ac8
Author:    ihse
Date:      2016-02-10 12:12 +0100
URL:       http://hg.openjdk.java.net/build-infra/jdk9/rev/814a7b7b8ac8

* Fix clang version detection
* Export Xcode toolchain version

! common/autoconf/generated-configure.sh
! common/autoconf/toolchain.m4