Rename the desktop OpenGL namespace to gl.

Bug 18962347

Change-Id: I0bb263b749d3af3362b2fdc02d81ab856e0f46b4
Reviewed-on: https://swiftshader-review.googlesource.com/1770
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>
diff --git a/src/OpenGL/libGL/Renderbuffer.cpp b/src/OpenGL/libGL/Renderbuffer.cpp
index a88d222..81fcd45 100644
--- a/src/OpenGL/libGL/Renderbuffer.cpp
+++ b/src/OpenGL/libGL/Renderbuffer.cpp
@@ -19,7 +19,7 @@
 #include "Texture.h"
 #include "utilities.h"
 
-namespace es2
+namespace gl
 {
 RenderbufferInterface::RenderbufferInterface()
 {