[Patch] Do not include <climits>

[Paolo Carlini]

Hi,

while working on something else, I noticed that by tweaking the 
codecvt_members.cc includes and consistently using __CHAR_BIT__ in 
stl_bvector.h too we can avoid including <climits> anywhere in the headers.

Tested x86/x86-64-linux, also --enable-clocale=generic and without PCHs.

Paolo.

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