Add lazperf.pxd to MANIFEST.in
Add lazperf.pxd to MANIFEST.in

So that it is included in the python sdist package
hobu/laz-perf,hobu/laz-perf,verma/laz-perf,verma/laz-perf,verma/laz-perf,hobu/laz-perf,hobu/laz-perf,verma/laz-perf,verma/laz-perf,hobu/laz-perf