Added explicit qualifiers to mem_fun calls, as workaround for broken std libs that don't put code in namespace std.

[SVN r11624]

test/boost_no_ptr_mem_const.ipp

@@ -80,8 +80,8 @@ public:
 
 int test()
 {
-   mem_fun(&tester::foo1);
-   mem_fun(&tester::foo2);
+   boost_no_pointer_to_member_const::mem_fun(&tester::foo1);
+   boost_no_pointer_to_member_const::mem_fun(&tester::foo2);
    return 0;
 }