bpo-38360: macOS: support alternate form of -isysroot flag (GH-16480)


It is possible to use either '-isysroot /some/path' (with a space) or
'-isysroot/some/path' (no space in between). Support both forms in
places where special handling of -isysroot is done, rather than just
the first form.
Co-authored-by: Ned Deily <nad@python.org>
(cherry picked from commit b310700976524b4b99ee319c947ca40468716fc9)

Co-authored-by: Joshua Root <jmr@macports.org>
5 files changed