hg: jdk9/sandbox/jdk: 8180486: extLink taglet needs escaped "&"

[chris.hegarty at oracle.com]

Changeset: 85ccf9e98ba0
Author:    ihse
Date:      2017-05-18 12:00 +0200
URL:       http://hg.openjdk.java.net/jdk9/sandbox/jdk/rev/85ccf9e98ba0

8180486: extLink taglet needs escaped "&"
Reviewed-by: dholmes

! make/src/classes/build/tools/taglet/ExtLink.java