pointing to Java 11 JDK generates calls to Java 11 library API

Change-Id: I5a515db8614d2266ca1257a43c1c3d2dbea3318e
Signed-off-by: Jay Arthanareeswaran <jarthana@in.ibm.com>
Reviewed-on: https://git.eclipse.org/r/c/jdt/eclipse.jdt.core/+/182280
Tested-by: JDT Bot <jdt-bot@eclipse.org>