RFR (XS) JDK-8072694: Need errno info when CDS archive creation fails

[harold seigel]

Hi,

Please review this small fix for bug 8072694.

Open webrev:  http://cr.openjdk.java.net/~hseigel/bug_8072694_errno/

JBS bug: https://bugs.openjdk.java.net/browse/JDK-8072694

The fix was regression tested with JPRT, JCK lang and VM tests, hotspot 
JTReg, and NSK quick tests. In addition, I ran tests that intentionally 
failed to create the archive and checked the generated errno messages.

Thanks, Harold