Remove invalid check in find_first_of

[Chris Jefferson]

Lets see if I can get a changelog and patch out perfectly this time!

std::find_first_of(iterator1, iterator1, iterator2, iterator2, predicate)
has a check to see if "*iterator1 == *iterator2" is valid. However, this 
isn't actually necessasary, all we need is that predicate(*iterator1, 
*iterator2) is valid (which is also checked for).

This patch therefore removes that invalid check.


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