GLSL/SPV: Fix #1196: Require resources to have layout(binding=X).

Test/glspv.frag

@@ -11,10 +11,10 @@ void main()
 {
 }
 
-uniform float f; // ERROR, no location
+uniform float f;                           // ERROR, no location
 layout(location = 2) uniform float g;
-uniform sampler2D s1;
-layout(location = 3) uniform sampler2D s2;
+uniform sampler2D s1;                      // ERROR, no binding
+layout(location = 3) uniform sampler2D s2; // ERROR, no binding
 
 void noise()
 {
@@ -24,4 +24,5 @@ void noise()
     noise4(1);
 }
 
+uniform atomic_uint atomic;                // ERROR, no binding
 layout(input_attachment_index = 1) uniform subpassInput sub; // ERROR, no inputs