opengl32: Use INT_PTR instead of ptrdiff_t in generated code to avoid printf warnings.

dlls/opengl32/make_opengl

@@ -119,10 +119,10 @@ my %debug_conv =
      "GLuint" => "%d",
      "GLushort" => "%d",
      "GLhalfNV" => "%d",
-     "GLintptrARB" => "%d",
-     "GLsizeiptrARB" => "%d",
-     "GLintptr" => "%d",
-     "GLsizeiptr" => "%d",
+     "GLintptrARB" => "%ld",
+     "GLsizeiptrARB" => "%ld",
+     "GLintptr" => "%ld",
+     "GLsizeiptr" => "%ld",
      "GLhandleARB" => "%d",
      "GLcharARB" => "%c",
      "GLvoid" => "(void)",
@@ -166,10 +166,10 @@ sub ConvertType($)
     my ($type) = @_;
 
     my %hash = ( "GLstring" => "const GLubyte *",
-	      "GLintptrARB" => "ptrdiff_t",
-	      "GLsizeiptrARB" => "ptrdiff_t",
-	      "GLintptr" => "ptrdiff_t",
-	      "GLsizeiptr" => "ptrdiff_t",
+	      "GLintptrARB" => "INT_PTR",
+	      "GLsizeiptrARB" => "INT_PTR",
+	      "GLintptr" => "INT_PTR",
+	      "GLsizeiptr" => "INT_PTR",
 	      "GLhandleARB" => "unsigned int",
 	      "GLcharARB" => "char",
 	      "GLchar" => "char",