Log Message:
To fix Linux readv/writev, back-port:
https://github.com/ZoneMinder/zoneminder/commit/417421b1d869d1b71c8ec1a1e3b082fcede6ce58#diff-484f666f58ec13f38fa402143f2f6ad8e63a013909d3941ffbb3d66745b20c8d

This is also needed by the Pkgsrc WIP version.

Bump PKGREVISION - though this change is unlikely to alter the outcome of
previously successful builds.