test-lib: Remove 3 year old no-op --no-python option

The --no-python option was added to test-lib.sh by Johannes Schindelin
in early 2006 in abb7c7b. It was later turned into a no-op by Junio C
Hamano in 7cdbff1 the same year.

Over three years is long enough before removing this old wart which
was retained for backwards compatibility. Our tests have been using
NO_PYTHON and "test_have_prereq PYTHON" for a long time now.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/test-lib.sh

@@ -134,9 +134,6 @@ do
 		with_dashes=t; shift ;;
 	--no-color)
 		color=; shift ;;
-	--no-python)
-		# noop now...
-		shift ;;
 	--va|--val|--valg|--valgr|--valgri|--valgrin|--valgrind)
 		valgrind=t; verbose=t; shift ;;
 	--tee)