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/Image.cpp b/src/OpenGL/libGL/Image.cpp
index 97b08d4..9e98db2 100644
--- a/src/OpenGL/libGL/Image.cpp
+++ b/src/OpenGL/libGL/Image.cpp
@@ -18,7 +18,7 @@
 
 #include <GLES2/gl2ext.h>
 
-namespace es2
+namespace gl
 {
 	static sw::Resource *getParentResource(Texture *texture)
 	{