RFR: JDK-8165232 XKeycodeToKeysym is deprecated and should be replaced with XkbKeycodeToKeysym

[Alan Burlison]

XKeycodeToKeysym is deprecated and when compiled on Solaris 12 with 
warnings-as-errors this causes a compile time failure. References to 
XKeycodeToKeysym should be replaced by XkbKeycodeToKeysym. As this is 
common XOrg code it will affect Linux as well.

Bug:    https://bugs.openjdk.java.net/browse/JDK-8165232
Webrev: http://cr.openjdk.java.net/~alanbur/JDK-8165232/
Thanks,

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Alan Burlison
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