8154269: Remove unused or unnecessary Xm/Xt files and header includes
Reviewed-by: serb, ssadetsky

8130507: closed/java/awt/font/JNICheck/JNICheck.sh test reports some warnings
Reviewed-by: azvegint, prr

8056216: Remove "sun" directory layer from libawt and common
Reviewed-by: erikj, ihse, coffeys