Log Message:
zutils: Update to 1.10

Changes in version 1.10:

A portability issue with Solaris 10 has been fixed.

It has been documented in the manual that 'zgrep -L' fails with GNU grep
versions 3.2 to 3.4 inclusive because of a wrong change reverted in GNU grep
3.5.

'make check' now tests empty input files with all tools except zupdate.