hg: build-infra/jdk8: By an unfortunate mistake, the bug fix in a9dfdedd8a4c (fix for Cygwin paths

[magnus.ihse.bursie at oracle.com]

Changeset: 2eb740db0f08
Author:    ihse
Date:      2012-09-21 11:49 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/2eb740db0f08

By an unfortunate mistake, the bug fix in a9dfdedd8a4c (fix for Cygwin paths
beginning with /usr/bin) reverted the changed introduced in 49cbdd92e2a1
(initial msys support). Restore those changes.

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