hg: jdk8u/jdk8u-dev/jdk: 8210891: Remove unused extutil.h from JDK8u sources

[dmitry.markov at oracle.com]

Changeset: 122a5802ac68
Author:    dmarkov
Date:      2018-10-04 10:16 +0100
URL:       http://hg.openjdk.java.net/jdk8u/jdk8u-dev/jdk/rev/122a5802ac68

8210891: Remove unused extutil.h from JDK8u sources
Reviewed-by: prr

! THIRD_PARTY_README
- src/solaris/native/sun/awt/extutil.h