Include pycparserext-master in FShell Witness2Test
Include pycparserext-master in FShell Witness2Test

This directory is shipped in the archive, but apparently not included in
the container. It's required with all recent versions of FShell
witness2test.

sosy-lab/benchexec,ultimate-pa/benchexec,sosy-lab/benchexec,dbeyer/benchexec,ultimate-pa/benchexec,sosy-lab/benchexec,ultimate-pa/benchexec,dbeyer/benchexec,ultimate-pa/benchexec,ultimate-pa/benchexec,dbeyer/benchexec,sosy-lab/benchexec,dbeyer/benchexec,sosy-lab/benchexec,ultimate-pa/benchexec,sosy-lab/benchexec