Revert "GL_ext_vulkan_glsl_relaxed extension support, and cross stage aware IO mapper"

Test/iomap.crossStage.vk.vert

@@ -1,32 +0,0 @@
-#version 460
-
-out vec4 vgo1; // declaration order different than fragment shader
-out vec2 vgo2; // declaration order different than fragment shader
-
-layout(location = 5) out outBlock {
-    vec4 o3;
-};
-
-layout (binding = 0) uniform sampler2D glass;
-
-uniform crossStageBlock1 {
-    uniform vec4 a;
-    vec4 b;
-};
-
-readonly buffer vertOnlyBlock {
-    vec2 vb1;
-};
-
-uniform crossStageBlock2 {
-    uniform vec4 a;
-    vec2 b;
-} blockName1 [2]; // instance name different from frag
-
-void main()
-{
-    vgo1 = vec4(0);
-    vgo2 = vec2(0);
-    o3 = vec4(0);
-}
-