hg: jdk/client: 8210866: Remove HPKeysym.h from JDK sources

[philip.race at oracle.com]

Changeset: f2d6750f5c10
Author:    prr
Date:      2018-09-24 11:46 -0700
URL:       http://hg.openjdk.java.net/jdk/client/rev/f2d6750f5c10

8210866: Remove HPKeysym.h from JDK sources
Reviewed-by: serb, dmarkov

! src/java.desktop/unix/legal/xwindows.md
- src/java.desktop/unix/native/libawt_xawt/awt/HPkeysym.h
! src/java.desktop/unix/native/libawt_xawt/xawt/XWindow.c