Add asctime64.t and ctime64.t to the tap_tests target so they'll be run

with "make test"

Change clean to just blow away all the t/*.t files which are all compiled
C programs.

Makefile

@@ -67,16 +67,12 @@ localtime_tests: t/localtime_test t/gmtime_test
 	TZ=Australia/West t/localtime_test | bzip2 -9 > t/oz_test.out.bz2
 	bzdiff -u t/oz_test.out.bz2 t/oztime.out.bz2 | less -F
 
-tap_tests: t/year_limit.t t/negative.t t/overflow.t t/timegm.t t/safe_year.t t/gmtime64.t
+tap_tests: t/year_limit.t t/negative.t t/overflow.t t/timegm.t t/safe_year.t t/gmtime64.t t/asctime64.t t/ctime64.t
 	@which prove > /dev/null || (echo 'You need prove (from the Test::Harness perl module) to run these tests'; exit 1)
 	@prove --exec '' t/*.t
 
 clean:
-	-rm 	t/year_limit.t 		\
-		t/negative.t		\
-		t/timegm.t		\
-		t/overflow.t		\
-		t/safe_year.t		\
+	-rm 	t/*.t 			\
 	   	t/localtime_test	\
 		t/gmtime_test		\
 		t/*_test.out.bz2	\