[TESTBUG] ctw failed to build after 8157957

After fixing JDK-8157957 ctw-library compilation failed with:

find: ‘../../../../test/lib/share/classes’: No such file or directory
src/sun/hotspot/tools/ctw/PathHandler.java:42: error: package jdk.test.lib does not exist
    private static final Unsafe UNSAFE = jdk.test.lib.Utils.getUnsafe();
                                                     ^
1 error
Makefile:60: recipe for target 'ctw.jar' failed
make: *** [ctw.jar] Error 1