centralizing 'export'

[Phil Edwards]

Right now we have a bunch of headers which all end with

    #ifdef _GLIBCPP_NO_TEMPLATE_EXPORT
    # define export
      ... do something unique to this file ...
    #endif

As part of cleaning up the STL headers and splitting the definitions out
into tcc files, I think I'm going to move

    #ifdef _GLIBCPP_NO_TEMPLATE_EXPORT
    # define export
    #endif

to c++config, and leave

    #ifdef _GLIBCPP_NO_TEMPLATE_EXPORT
      ... do something unique to this file ...
    #endif

behind in the headers.

This will have zero effect, since valarray is the only class actually
declaring anything as 'export', and that file was already inside a '#define
export' region of code.  But it's slightly cleaner.


Phil

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