Change a comparison in the float hashing code, which can cause a warning on

gcc. Although the warning doesn't currently turn up in this branch, it could
be caused quite easily. Originally reported in:

http://lists.boost.org/Archives/boost/2007/08/126084.php


[SVN r38883]

libs/functional

@@ -1 +1 @@
-Subproject commit 75e994b306dc223af9ac865f777565d74e92246a
+Subproject commit 993129e7e09cd6366358a284fd4de22cade28462