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

[dmitry.markov at oracle.com]

Changeset: 9ff825f28ebd
Author:    dmarkov
Date:      2018-10-04 10:19 +0100
URL:       http://hg.openjdk.java.net/jdk8u/jdk8u-dev/langtools/rev/9ff825f28ebd

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

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