[v3 PATCH] Fix bootstrap failure on powerpc-apple-darwin7.9.0

[Roger Sayle]

The issue is the Mac OS X 10.3.9 defines the macro "_T" in its
system headers, which conflicts with a recent usage in the source
file include/std/system_error.  The fix is the same as used elsewhere
in libstdc++v3, to avoid using _T and use the identifier "_Tp"
instead.

Tested on powerpc-apple-darwin7.9.0 where this restores bootstrap.

Ok for mainline?

2008-07-05  Roger Sayle  <roger@eyesopen.com>

        * include/std/system_error (is_error_code_enum): Use identifier
        _Tp instead of _T to avoid conflict with system macro on Darwin.
        (is_error_condition_enum): Likewise.

 Roger
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