hg: jdk/jdk: 8244592: Start supporting SOURCE_DATE_EPOCH

[magnus.ihse.bursie at oracle.com]

Changeset: dea6a63e9ab0
Author:    ihse
Date:      2020-05-07 17:47 +0200
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/dea6a63e9ab0

8244592: Start supporting SOURCE_DATE_EPOCH
Reviewed-by: erikj

! make/Init.gmk
! make/InitSupport.gmk
! make/autoconf/configure.ac
! make/autoconf/jdk-options.m4
! make/autoconf/jdk-version.m4
! make/autoconf/spec.gmk.in
! make/autoconf/util.m4