Patch for libstdc++-v3 on HP-UX

[Benjamin Kosnik]

> The problem is that these macros are defined in c++config but
> c++config includes the hpux/os_defines.h file before it defines the
> macros.  I suppose we could try changing c++config to define the
> macros before including the system specific headers but that might
> just cause more problems on other platforms.  My proposal is to just
> not use the macros.
> 
> OK for checkin?

This won't work for inclusion as "C", not C++. So, I'd rather try to
define the macros before inclusion of system specific headers. 

I looked through os_defines.h and cpu_defines.h: I think this will be
possible, as attached. 

tested x86/linux

-benjamin
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