linux.mt (IO_OBJECTS): Add iogetline.o.

linux.mt (IO_OBJECTS): Add iogetline.o.

        * config/linux.mt (IO_OBJECTS): Add iogetline.o.
        * config/linuxlibc1.mt: Ditto.
        * iogetline.c (_IO_getline_info): Renamed from _IO_getline.
        (_IO_getline): Just call _IO_getline_info.
        * isgetline.cc (istream::getline, istream::get, _sb_readline):
        Call _IO_getline_info instead of _IO_getline and get the EOF
        information.
        * sbgetline.cc (streambuf::sgetline): Ditto.
        * libioP.h (_IO_getline_info): New declaration.
        * iogetline.c (_IO_getline): Handle the case when there is no
        buffer.

From-SVN: r18042