<AWT Dev> [8u] RFR: 8210891: Remove unused extutil.h from JDK8u sources

[Dmitry Markov]

Hello,

Could you review the following fix, please?

	bug: https://bugs.openjdk.java.net/browse/JDK-8210891 <https://bugs.openjdk.java.net/browse/JDK-8210891>
	webrev: http://cr.openjdk.java.net/~dmarkov/8210891/webrev.00/ <http://cr.openjdk.java.net/~dmarkov/8210891/webrev.00/>

Removed extutil.h and updated TPRMs accordingly.

Thanks in advance,
Dmitry 
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