merge [74470], [74481], [74513], [74527] from trunk; fixes #4723, #5905

[SVN r74534]

libs/proto

@@ -1 +1 @@
-Subproject commit 71555e741316d97c513e8860e760b3cfa2a52685
+Subproject commit 80cbfcf32f463d4bafa6d070234fc8d544d24316

status/explicit-failures-markup.xml

@@ -2750,6 +2750,7 @@ for more information.
         <toolset name="sun-5.10"/>
         <toolset name="borland-*"/>
         <toolset name="vacpp"/>
+        <toolset name="vacpp-*"/>
       </mark-unusable>
     </library>