hg: build-infra/jdk8: JDK-8005442 autogen.sh sets DATE_WHEN_GENERATED to empty string on Solaris version 11 or later

[tim.bell at oracle.com]

Changeset: 79b2023af9ed
Author:    tbell
Date:      2012-12-23 16:43 -0800
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/79b2023af9ed

JDK-8005442 autogen.sh sets DATE_WHEN_GENERATED to empty string on Solaris version 11 or later

! common/autoconf/autogen.sh
! common/autoconf/generated-configure.sh