[patch]: Remove unnecessary overloads in stl_function.h

[caj]

In stl_function.h, the various mem_fun templates are defined. I was 
digging through this when I noticed that there was a set of specialised 
overloads for void. These are noted as only been necessary if the 
compiler doesn't support partial specialization, and of course g++ does!

The following patch removes the unnessasary overloads and adds a test file.


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