remove some useless tests from 'broken' directory

tests/broken/builtintype.pyx

-cdef int f() except -1:
-    cdef type t1, t2
-    cdef object x
-    cdef int b
-    b = typecheck(x, t1)
-    b = issubtype(t1, t2)

tests/broken/newstyleintforloop.pyx

-cdef int f() except -1:
-    cdef int i, x, y
-    for x < i < y:
-        pass

tests/broken/oldstyleintforloop.pyx

-cdef int f() except -1:
-    cdef int i, x, y
-    for i from x < i < y:
-        pass