hg: jdk7/tl/langtools: 6854244: change source/target used to compile JDK to 7

[jonathan.gibbons at sun.com]

Changeset: cf08b64e87da
Author:    jjg
Date:      2009-07-27 15:20 -0700
URL:       http://hg.openjdk.java.net/jdk7/tl/langtools/rev/cf08b64e87da

6854244: change source/target used to compile JDK to 7
Reviewed-by: ohair

! make/build.properties