Remove int-type bug on Windows in skimage.measure.label (#72)

A windows user reported an issue with `skimage.measure.label` in the older `cupyimg` repository: mritools/cupyimg#21.

It seems the same issue is present here, but should be resolved by this PR. I don't think we can easily add a test case on our current linux-based CI as the issue has to do with the NumPy dtype character used to represent the `numpy.int32` dtype. We may want to wait on merging until the fix is confirmed in mritools/cupyimg#21

I think I originally introduced this `int_types` dict with the intention of also supporting >32-bit integers, but it was incomplete and still used `int32` in the actual implementation. This PR just removes this dict altogether and we can revisit the function if we get a request for int64 support.

Authors:
  - Gregory R. Lee (https://github.com/grlee77)

Approvers:
  - https://github.com/jakirkham

URL: #72

python/cucim/src/cucim/skimage/measure/_label_kernels.py

@@ -21,22 +21,10 @@ def _label(x, structure, y, greyscale_mode=False):
     y_shape = cupy.array(y.shape, dtype=numpy.int32)
     count = cupy.zeros(2, dtype=numpy.int32)
     _kernel_init()(x, y)
-    try:
-        int_t = int_types[y.dtype.char]
-    except KeyError:
-        raise ValueError("y must have int32, uint16, uint32 or uint64 dtype")
-    if int_t != "int":
-        raise NotImplementedError(
-            "Currently only 32-bit integer case is implemented"
-        )
     if greyscale_mode:
-        _kernel_connect(True, int_t)(
-            x, y_shape, dirs, ndirs, x.ndim, y, size=y.size
-        )
+        _kernel_connect(True)(x, y_shape, dirs, ndirs, x.ndim, y, size=y.size)
     else:
-        _kernel_connect(False, int_t)(
-            y_shape, dirs, ndirs, x.ndim, y, size=y.size
-        )
+        _kernel_connect(False)(y_shape, dirs, ndirs, x.ndim, y, size=y.size)
     _kernel_count()(y, count, size=y.size)
     maxlabel = int(count[0])  # synchronize
     labels = cupy.empty(maxlabel, dtype=numpy.int32)
@@ -184,11 +172,3 @@ def _kernel_finalize():
         """,
         "cucim_skimage_measure_label_finalize",
     )
-
-
-int_types = {
-    "i": "int",
-    "H": "unsigned short",
-    "I": "unsigned int",
-    "L": "unsigned long long",
-}