Removing GCC check for hash_set/hash_map so we don't automatically break any

code. Added a section of workarounds to the documentation.


[SVN r50189]

libs/graph

@@ -1 +1 @@
-Subproject commit bc707a8f6737196d3de5222d95d3fe712cdfaf0b
+Subproject commit 4a2994c9d747d502d4b040c2b4f6f02e10bf0082