RFR: JDK-8042348: Copyright link in Javadoc page for Java SE 8

[Erik Joelsson]

Hello,

Please review this small patch to javadoc generation. The Copyright 
footer, at the bottom of the page, should be a link, but in jdk8 and 9 
it isn't. This is caused by COPYRIGHT_URL being empty if 
JDK_MINOR_VERSION is not 7. I see no reason to have a jdk version 
dependency on this URL since the value isn't dependent on jdk version.

This will likely need a backport to 8 too.

Bug: https://bugs.openjdk.java.net/browse/JDK-8042348
Patch inline:
diff -r 183052721803 make/Javadoc.gmk
--- a/make/Javadoc.gmk
+++ b/make/Javadoc.gmk
@@ -115,10 +115,7 @@
  DOCSDIR_URL = {@docroot}/$(GET2DOCSDIR)

  # Url to copyright html file
-COPYRIGHT_URL-7 = $(DOCSDIR_URL)/legal/cpyr.html
-# This isn't added in old build yet.
-#COPYRIGHT_URL-8 = $(DOCSDIR_URL)/legal/cpyr.html
-COPYRIGHT_URL = $(COPYRIGHT_URL-$(JDK_MINOR_VERSION))
+COPYRIGHT_URL = $(DOCSDIR_URL)/legal/cpyr.html

  # Url to bug filing site