base: tracelib: reduce kevent batch size
base: tracelib: reduce kevent batch size

We don't need to process up to 1024 requests at the same time.
Increasing this number increases memory usage and the risk of file
descriptor exhaustion. Reducing it just causes more iterations of the
kevent loop.

git-svn-id: 620571fa9b4bd0cbce9a0cf901e91ef896adbf27@140642 d073be05-634f-4543-b044-5fe20cf6d1d6

neverpanic/macports-base,danchr/macports-base,danchr/macports-base,macports/macports-base,neverpanic/macports-base,macports/macports-base