RFR: 7903539: Please make jtreg build date reproducible

[Vladimir Petko]

This PR is an upstream of the patch by Chris Lamb (lamby at debian.org)[1].

Testing:

$ export SOURCE_DATE_EPOCH=1
$ bash make/build.sh 
...
$ cp build/images/jtreg/lib/jtreg.jar 1.jar
$ bash make/build.sh 
...
$ strip-nondeterminism build/images/jtreg/lib/jtreg.jar 
$ strip-nondeterminism 1.jar 
$ diff 1.jar build/images/jtreg/lib/jtreg.jar 
$ jar xvf 1.jar
$ cat META-INF/MANIFEST.MF 
Manifest-Version: 1.0
Main-class: com.sun.javatest.regtest.Main
Class-Path: javatest.jar asmtools.jar
jtreg-Name: jtreg
jtreg-VersionString: 7.3.1-dev+0
jtreg-Version: 7.3.1
jtreg-Milestone: dev
jtreg-Build: 0
jtreg-BuildJavaVersion: Java(TM) 2 SDK, Version 17.0.8+7-Ubuntu-123.04
jtreg-BuildDate: January 01, 1970
Created-By: 17.0.8 (Private Build)



[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1038957

-------------

Commit messages:
 - Pass SOURCE_DATE_EPOCH to the build

Changes: https://git.openjdk.org/jtreg/pull/170/files
 Webrev: https://webrevs.openjdk.org/?repo=jtreg&pr=170&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903539
  Stats: 8 lines in 1 file changed: 7 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jtreg/pull/170.diff
  Fetch: git fetch https://git.openjdk.org/jtreg.git pull/170/head:pull/170

PR: https://git.openjdk.org/jtreg/pull/170