hg: jdk9/dev: 8033292: only warn, not fail, on unknown variables in configure

[magnus.ihse.bursie at oracle.com]

Changeset: bd59753b56bf
Author:    ihse
Date:      2014-01-31 10:24 +0100
URL:       http://hg.openjdk.java.net/jdk9/dev/rev/bd59753b56bf

8033292: only warn, not fail, on unknown variables in configure
Reviewed-by: erikj

! common/autoconf/basics.m4
! common/autoconf/generated-configure.sh