grep: Update to 2.25

grep: Update to 2.25

Fixes: #11104
** Bug fixes

  In the C or POSIX locale, grep now treats all bytes as valid
  characters even if the C runtime library says otherwise.  The
  revised behavior is more compatible with the original intent of
  POSIX, and the next release of POSIX will likely make this official.
  [bug introduced in grep-2.23]

  grep -Pz no longer mistakenly diagnoses patterns like [^a] that use
  negated character classes. [bug introduced in grep-2.24]

  grep -oz now uses null bytes, not newlines, to terminate output lines.
  [bug introduced in grep-2.5]

** Improvements

  grep now outputs details more consistently when reporting a write error.
  E.g., "grep: write error: No space left on device" rather than just
  "grep: write error".

also posted as:
  https://savannah.gnu.org/forum/forum.php?forum_id=8523

Signed-off-by: Alexander Marx <alexander.marx@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>