Fix for 6888888 breaks the build

[Andrew John Hughes]

The fix for bug 6888888:

http://hg.openjdk.java.net/jdk7/build/jdk/rev/777714bd992a

breaks the build as it tries to use javah from ALT_JDK_IMPORT_DIR (via
JAVA_TOOLS_DIR) which is not set on normal builds.
The README tells the user to set ALT_BOOTDIR and changing
JAVA_TOOLS_DIR to be set to BOOTDIR makes the build work again:

http://cr.openjdk.java.net/~andrew/javah/webrev.01/

Ok to push?
-- 
Andrew :-)

Free Java Software Engineer
Red Hat, Inc. (http://www.redhat.com)

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