PATCH: fix for BR1675

[Dirk Mueller]

Hi, 

I sat down and stripped the header files until I found the reason for the 
ambiguous overload. The reason are the stl_relop's pulled into the std 
namespace, i.e. in function.h. 

removing these includes fixes the problems and don't seem to cause 
additional failures for make check nor other sources I tried. 

Appended the patch for review and (possible) inclusion. Thanks. 


Dirk