More subtle checking for redeclarations:

- 300 doesn't allow built-in overload, while 100 does, while neither allows redefining
 - block name can't be reused for block name within the same interface 
   (though, the spec. isn't clear about that, it's easier than verifying member matches, will file bug on it)


git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@23984 e7fa87d3-cd2b-0410-9028-fcbf551c1848

Test/430scope.vert

@@ -18,11 +18,15 @@ float b(int a);      // ERROR: redefinition
 
 float f;             // ERROR: redefinition
 float tan;           // okay, hides built-in function
-float sin(float x);  // okay, can overload built-in functions
-float cos(float x)   // okay, can overload built-in functions
+float sin(float x);  // okay, can redefine built-in functions
+float cos(float x)   // okay, can redefine built-in functions
 {
 	return 1.0;
 }
+bool radians(bool x) // okay, can overload built-in functions
+{
+    return true;
+}
 
 invariant gl_Position;