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

[tim . bell]

Changeset: 7a3c6ffdf1fb
Author:    tbell
Date:      2013-01-07 14:01 -0800
URL:       http://hg.openjdk.java.net/jdk8/build/rev/7a3c6ffdf1fb

8005442: autogen.sh sets DATE_WHEN_GENERATED to empty string on Solaris version 
11 or later
Reviewed-by: ohair

! common/autoconf/autogen.sh