libstdc++/7744: streambuf::in_avail() always returns 0 (zero) for cin input stream

[bkoz@gcc.gnu.org]

Synopsis: streambuf::in_avail() always returns 0 (zero) for cin input stream

Responsible-Changed-From-To: unassigned->bkoz
Responsible-Changed-By: bkoz
Responsible-Changed-When: Mon Nov 11 15:19:52 2002
Responsible-Changed-Why:
    Mine.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7744