Updated glLoadGen-generated files.

Includes fix described on https://bitbucket.org/alfonse/glloadgen/issue/29/compilation-errors-on-mac-os-x ,
which fixes warnings related to conversion and deprecated API on OS X.

external/OpenGL/GL/gl_magnum.c

@@ -4,27 +4,15 @@
 #include "gl_magnum.h"
 
 #if defined(__APPLE__)
-#include <mach-o/dyld.h>
+#include <dlfcn.h>
 
-static void* AppleGLGetProcAddress (const GLubyte *name)
+static void* AppleGLGetProcAddress (const char *name)
 {
-  static const struct mach_header* image = NULL;
-  NSSymbol symbol;
-  char* symbolName;
+  static void* image = NULL;
   if (NULL == image)
-  {
-    image = NSAddImage("/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL", NSADDIMAGE_OPTION_RETURN_ON_ERROR);
-  }
-  /* prepend a '_' for the Unix C symbol mangling convention */
-  symbolName = malloc(strlen((const char*)name) + 2);
-  strcpy(symbolName+1, (const char*)name);
-  symbolName[0] = '_';
-  symbol = NULL;
-  /* if (NSIsSymbolNameDefined(symbolName))
-	 symbol = NSLookupAndBindSymbol(symbolName); */
-  symbol = image ? NSLookupSymbolInImage(image, symbolName, NSLOOKUPSYMBOLINIMAGE_OPTION_BIND | NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR) : NULL;
-  free(symbolName);
-  return symbol ? NSAddressOfSymbol(symbol) : NULL;
+    image = dlopen("/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL", RTLD_LAZY);
+
+  return image ? dlsym(image, name) : NULL;
 }
 #endif /* __APPLE__ */