RFR: :tier1 XS testfix: 8218944: Fix failed for JDK-8218936

[Jonathan Gibbons]

Sigh, the fix for JDK-8218936 broke a nearby test.

It's a test to check links, but which was checking that a specific error 
message about an invalid tag was present. This looks like another 
side-effect of the removal for HTML4 support.

The fix is to remove the check and update the test for the exit code.

With this fix, all javadoc tests pass.

JBS: https://bugs.openjdk.java.net/browse/JDK-8218944

-- Jon


$ hg diff
diff -r 2d5023bad20a 
test/langtools/jdk/javadoc/doclet/testLinkOption/TestLinkOption.java
--- 
a/test/langtools/jdk/javadoc/doclet/testLinkOption/TestLinkOption.java 
Wed Feb 13 17:18:56 2019 -0800
+++ 
b/test/langtools/jdk/javadoc/doclet/testLinkOption/TestLinkOption.java 
Wed Feb 13 17:49:39 2019 -0800
@@ -69,9 +69,7 @@
                  "-linkoffline", url, testSrc + "/jdk",
                  "-package",
                  "pkg", "mylib.lang");
-        checkExit(Exit.ERROR);
-        checkOutput(Output.OUT, true,
-                "tag not supported in the generated HTML version: tt");
+        checkExit(Exit.OK);

          checkOutput("pkg/C.html", true,
                  "<a href=\"" + url + 
"java/lang/String.html?is-external=true\" "