Iostreams: Merge test fixes from trunk.

- Remove obselete filesystem code and test (jhunold).
- Fix gzip test failures for some C++0x compilers.


[SVN r78433]

libs/iostreams

@@ -1 +1 @@
-Subproject commit 60a17055733fbbc4426cf206f0f92bf96891b1a5
+Subproject commit d961d148359253df27a0e4eb94fc273a68146961