- Update to grep 2.27
  * grep no longer reports a false match in a multibyte, non-UTF8 locale
    like zh_CN.gb18030, with a regular expression like ".*7" that just
    happens to match the 4-byte representation of gb18030's \uC9, the
    final byte of which is the digit "7".
  * grep by default now reads all of standard input if it is a pipe,
    even if this cannot affect grep's output or exit status.
  * grep no longer mishandles ranges in nontrivial unibyte locales.
  * grep -P no longer attempts multiline matches.
  * grep -m0 -L PAT FILE now outputs "FILE".
  * To output ':' and tab-align the following character C, grep -T no
    longer outputs tab-backspace-':'-C, an approach that has problems if
    run inside an Emacs shell window.
  * grep -T now uses worst-case widths of line numbers and byte offsets
    instead of guessing widths that might not work with larger files.
  * grep no longer reads the input in a few more cases when it is easy to
    see that matching cannot succeed, e.g., 'grep -f /dev/null'. (forwarded request 444685 from Andreas_Schwab)

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