weak for Darwin

[Aaron W. LaFramboise]

Geoff Keating wrote:

>>OK.  What do you think about adding a macro named something like
>>_GLIBCXX_WEAK_DEFINITION that is __attribute__((weak)) for Darwin,
>>nothing for PE targets, and whatever the concensus is for other 
>>targets?
> 
> Sure.  Will you make a patch, or should I?

I'm not really sure where the correct place to define this macro is.
The attached patch puts it in include/bits/c++config and the override in
config/os/mingw32/os_defines.h.  Is this right?

Aaron W. LaFramboise
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