Binding OpenGL functions based on glGetString on iOS
I am using functions that technically require `GL_VERSION` 3.3, but `GL_VERSION` on iOS reports a lower version, which causes glad to not bind these functions even though they are in fact supported on iOS. I currently use a nasty hack to make things work, where I bind my own `glGetString` to trick glad into thinking that the supported version is 3.3, implemented as:

```
GLubyte const * (*real_glGetString)( GLenum name );

GLubyte const * glGetString_( GLenum name )
{
	if( name==GL_VERSION )
		return (GLubyte const *)("3.3 hack see " __FILE__);
	else
		return real_glGetString(name);
}
```

I'm hoping there is a better way.