ParaViewDetermineVersion: remove the --git-dir argument
This is a partial revert of 12518d64.
The WORKING_DIRECTORY
handles what is necessary here.
On setups where Cygwin and Git-for-Windows coexist, the paths generated here can confuse the discovered git executable if they're not in the format expected by its runtime.
See post-merge discussion on !1970 (merged).
Reported-by: Kenneth Moreland kmorel@sandia.gov