BUG FIX: added import before __all__ reference (to satisfy pylint)
BUG FIX: link against required python libraries
BUG FIX: set argv[0] to full pathname of script (path resolution)
BUG FIX: corrected posix prototype
BUG FIX: on posix, -1 looks like 255, so we test exit for Not 0
BUG FIX: Exclude sign_code tests on posix
Merge branch 'bfix-posix-build'