cpplib: Fix __cplusplus definition

[Gabriel Dos Reis]

Phil Edwards <pedwards@disaster.jaj.com> writes:

| On Fri, Jan 26, 2001 at 01:06:28PM -0800, Benjamin Kosnik wrote:
| > 
| > phil you need to switch to include/c/bits from include/c_std/bits for 
| > headers like this. That's why that directory was created. It should work.
| 
| No joy.  :-(  I get the same results from three fresh builds, using each
| of c, c_std, c_shadow.

Then, something must be wrong with our architecture -- we should coope
with compliant system headers.  Sigh.

-- Gaby
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