Tidy up a couple of shim types

Author: jonathanhogg

src/flitter/render/window/__init__.py

@@ -406,7 +406,6 @@ def get_function(name, *signature):
             GLFWLoader.FUNCTIONS[name] = function
         return function
 
-    @GLFUNCTYPE(None, ctypes.c_int, ctypes.c_int)
     @GLFUNCTYPE(None, ctypes.c_uint, ctypes.c_uint)
     @staticmethod
     def shim_glClampColor(target, clamp):
@@ -418,7 +417,7 @@ def shim_glClearDepth(depth):
         glClearDepthf = GLFWLoader.get_function('glClearDepthf', None, ctypes.c_float)
         glClearDepthf(depth)
 
-    @GLFUNCTYPE(None, ctypes.c_int)
+    @GLFUNCTYPE(None, ctypes.c_uint)
     @staticmethod
     def shim_glDrawBuffer(buf):
         glDrawBuffers = GLFWLoader.get_function('glDrawBuffers', None, ctypes.c_uint, ctypes.POINTER(ctypes.c_uint))