Set -Xdoclint:none

Mac builds use a javadoc tool that fails on more warnings than linux
builds.  Add -Xdoclint:none to all java 8 standard doclet javadoc
commands.

Don't add it to javadoc commands that use the com.google.doclava.Doclava
doclet, it doesn't understand -Xdoclint:none.

Change-Id: I6c2f69555ca64b028d22b06286156491f51ac86c

core/droiddoc.mk

@@ -215,6 +215,7 @@ $(full_target): $(full_src_files) $(full_java_lib_deps)
                 \@$(PRIVATE_SRC_LIST_FILE) \
                 -J-Xmx1024m \
                 -XDignore.symbol.file \
+                $(if $(EXPERIMENTAL_USE_JAVA8),-Xdoclint:none) \
                 $(PRIVATE_PROFILING_OPTIONS) \
                 $(addprefix -classpath ,$(PRIVATE_CLASSPATH)) \
                 $(addprefix -bootclasspath ,$(PRIVATE_BOOTCLASSPATH)) \