include/haiku: fix comment typo

Cc: Alexander von Gluck IV <kallisti5@unixzen.com>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

include/HaikuGL/OpenGLKit.h

@@ -7,4 +7,4 @@
 
 // Projects needing GL/glu.h and GL/glut.h should now
 // include these headers independently as glu and glut
-// are no longe core parts of mesa
+// are no longer core parts of mesa