hg: nio/nio: 6827026: Change javac source and target default to 7

[alan.bateman at sun.com]

Changeset: 54d14906940b
Author:    jjg
Date:      2009-05-20 14:02 -0700
URL:       http://hg.openjdk.java.net/nio/nio/rev/54d14906940b

6827026: Change javac source and target default to 7
Reviewed-by: darcy, ohair

! make/Defs-internal.gmk