[shared_ptr] support for STLport 5's no-iostreams mode

[vividos]

In STLport there is a mode called no-iostreams mode.
When the define _STLP_NO_IOSTREAMS is used, nothing of
the iostreams-part of the Standard C++ Library can be
used, and including the headers fails with an error.
The advantage of this mode is that the user doesn't
have to link against a built library, all STLport code
is inline.

Unfortunately the shared_ptr cannot be used in this
mode, since an operator<< is defined in shared_ptr.hpp.
This patch ifdef's out this operator when
_STLP_NO_IOSTREAMS symbol is defined (and it does the
same with intrusive_ptr.hpp). The patch is against the
1.34 branch of CVS.

[Peter Dimov]

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Applied to 1.34 and HEAD.

[sf-robot]

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