With newer versions of javadoc (since JDK-1.8), "make doc-javahl"
reports many errors, causing build failures. Add "-Xdoclint:none"
option to restore old, sloppy behavior.

Patch created for subversion-1.8.16, should work for other other
versions, too.
See <https://bugs.gentoo.org/show_bug.cgi?id=551094>

--- a/Makefile.in
+++ b/Makefile.in
@@ -650,7 +650,7 @@
 
 # Generate API documentation for the JavaHL package.
 doc-javahl:
-	$(JAVADOC) -d $(abs_builddir)/doc/javadoc \
+	$(JAVADOC) -Xdoclint:none -d $(abs_builddir)/doc/javadoc \
 	  -sourcepath $(top_srcdir)/subversion/bindings/javahl/src \
 	  -link http://java.sun.com/javase/6/docs/api/ \
 	  org.tigris.subversion.javahl \