[PATCH] Make std::list::iterator == and != global inline friend

[François Dumont]

As we talked one day I would like to make all iterator operators global 
for consistency. So here is the patch to do so for std::list iterators.

Thanks to this change the operators ==(iterator, const_iterator) and != 
are not necessary anymore, one less ==|!= operator candidate.

 Â Â Â  * include/bits/stl_list.h
 Â Â Â  (_List_operator<>::operator==): Make global inline friend.
 Â Â Â  (_List_operator<>::operator!=): Likewise.
 Â Â Â  (_List_const_operator<>::operator==): Likewise.
 Â Â Â  (_List_const_operator<>::operator!=): Likewise.
 Â Â Â  (operator==(const _List_iterator<>&, const _List_const_iterator<>&)):
 Â Â Â  Remove.
 Â Â Â  (operator!=(const _List_iterator<>&, const _List_const_iterator<>&)):
 Â Â Â  Remove.

Tested under Linux x86_64.

Ok to commit ?

François
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