hg: build-infra/jdk8: * Don't try to test link.exe on Windows if it's not found.

[magnus.ihse.bursie at oracle.com]

Changeset: 0a3c1ecb2514
Author:    ihse
Date:      2012-09-19 15:12 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/0a3c1ecb2514

* Don't try to test link.exe on Windows if it's not found.
* cpio is not used; remove
* df is not required -- skip local disk check if not present
* mktemp is required, add as check for required program.

! common/autoconf/basics.m4
! common/autoconf/generated-configure.sh
! common/autoconf/spec.gmk.in
! common/autoconf/toolchain.m4