Split the hash pointer tests into tests for normal pointers and function pointers, as function pointers fail on old versions of Visual C++, and add a note about this to the hash documentaion.

[SVN r28389]

libs/functional

@@ -1 +1 @@
-Subproject commit 8da0e0104628704f52a71cd4f3682e8ed9776e05
+Subproject commit 8dc87153e95a59fe7cd0bace0e2dea94ab1127ba