Since ninja uses getopt_long to parse the argument, we need to suppose
-j100 and -tclean.
Please see ReadFlags function in:
https://github.com/ninja-build/ninja/blob/master/src/ninja.cc

Change-Id: If61f05e66be546a591549f6f153cce994c972309
Reviewed-on: https://chromium-review.googlesource.com/c/1335428Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>