* libio/fileops.c (_IO_file_xsgetn_mmap): Always set EOF flag is
not enough content is available.
* libio/tst-eof.c: New file.
* libio/Makefile (tests): Add tst-eof.
* libio/fileops.c (_IO_file_underflow_mmap): Read a single byte to
update atime.
* libio/tst-atime.c: New file.
* libio/Makefile (tests): Add tst-atime.
