Updated GLintptr and GLsizeiptr to be the appropiate types on 64 bit Windows

include/GL/glext.h

Index: include/GL/glext.h
===================================================================
--- include/GL/glext.h	(revision 240919)
+++ include/GL/glext.h	(working copy)
@@ -6149,15 +6149,25 @@
 
 #ifndef GL_VERSION_1_5
 /* GL types for handling large vertex buffer objects */
-typedef signed long int GLintptr;
-typedef signed long int GLsizeiptr;
+#ifdef _WIN64
+typedef signed   long long int GLintptr;
+typedef signed   long long int GLsizeiptr;
+#else
+typedef signed   long  int     GLintptr;
+typedef signed   long  int     GLsizeiptr;
 #endif
+#endif
 
 #ifndef GL_ARB_vertex_buffer_object
 /* GL types for handling large vertex buffer objects */
-typedef signed long int GLintptrARB;
-typedef signed long int GLsizeiptrARB;
+#ifdef _WIN64
+typedef signed   long long int GLintptrARB;
+typedef signed   long long int GLsizeiptrARB;
+#else
+typedef signed   long  int     GLintptrARB;
+typedef signed   long  int     GLsizeiptrARB;
 #endif
+#endif
 
 #ifndef GL_ARB_shader_objects
 /* GL types for program/shader text and shader object handles */