Fix missing Register() entry function for OpenGL ES 1.1.

Change-Id: I43c782a244996aac7bbafd9cb857a3063a68b5a1
Reviewed-on: https://swiftshader-review.googlesource.com/7391
Tested-by: Nicolas Capens <capn@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>
diff --git a/src/OpenGL/libGLES_CM/main.cpp b/src/OpenGL/libGLES_CM/main.cpp
index 77c4157..7cd2dfd 100644
--- a/src/OpenGL/libGLES_CM/main.cpp
+++ b/src/OpenGL/libGLES_CM/main.cpp
@@ -1412,6 +1412,10 @@
 	return es1::DrawTexfvOES(coords);
 }
 
+void GL_APIENTRY Register(const char *licenseKey)
+{
+	// Nothing to do, SwiftShader is open-source
+}
 }
 
 LibGLES_CMexports::LibGLES_CMexports()