Revert "refactor negative height check into its own file"

This reverts commit 42fda8a.

Author: FoamyGuy

adafruit_imageload/bmp/__init__.py

@@ -50,13 +50,7 @@ def load(file, *, bitmap=None, palette=None):
     # print(bmp_header_length)
     file.seek(0x12)  # Width of the bitmap in pixels
     width = int.from_bytes(file.read(4), "little")
-    try:
-        height = int.from_bytes(file.read(4), "little")
-    except OverflowError:
-        raise NotImplementedError(
-            "Negative height BMP files are not supported on builds without longint"
-        )
-
+    height = int.from_bytes(file.read(4), "little")
     file.seek(0x1C)  # Number of bits per pixel
     color_depth = int.from_bytes(file.read(2), "little")
     file.seek(0x1E)  # Compression type

adafruit_imageload/bmp/indexed.py

@@ -29,11 +29,9 @@
 
 """
 
-__version__ = "0.10.0"
+__version__ = "0.0.0-auto.0"
 __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_ImageLoad.git"
 
-import sys
-
 
 def load(
     file,
@@ -73,12 +71,9 @@ def load(
         while colors > 2 ** minimum_color_depth:
             minimum_color_depth *= 2
 
-        if sys.maxsize > 1073741823:
-            # pylint: disable=import-outside-toplevel
-            from negative_height_check import negative_height_check
-
-            # convert unsigned int to signed int when height is negative
-            height = negative_height_check(height)
+        # convert unsigned int to signed int when height is negative
+        if height > 0x7FFFFFFF:
+            height = height - 4294967296
         bitmap = bitmap(width, abs(height), colors)
         file.seek(data_start)
         line_size = width // (8 // color_depth)