Do not set svn:ignore props when committing perf data.

The perf data is migrating to github, but we are going to use the svn interface
to simplify the transition. The repos already have .gitignore files and they
will not understand svn:ignore properties anyway.

git-svn-id: http://svn.code.sf.net/p/chapel/code/trunk@23867 3a8e244f-b0f2-452b-bcba-4c88e055c3ca