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

Test/iomap.crossStage.2.frag

@@ -1,42 +0,0 @@
-#version 460
-
-
-layout(location = 5) in outBlock {
-    vec4 o3;
-};
-
-
-in vec4 gfo1;
-in vec2 gfo2;
-
-out vec4 outColor;
-
-uniform vec2 u1;
-uniform vec3 u2;           // initializer present in vertex stage
-uniform vec4 u3 = vec4(0); // initializer matches initializer in vertex stage
-
-uniform mat2 um2 = mat2(4.0);
-
-layout (location = 0, binding = 0) uniform sampler2D glass;
-
-uniform crossStageBlock1 {
-    uniform vec4 a;
-    vec4 b;
-};
-
-buffer fragOnlyBlock {
-    vec2 fb1;
-};
-
-uniform crossStageBlock2 {
-    uniform vec4 a;
-    vec2 b;
-} blockName2 [2]; // instance name different from vert
-
-
-void main()
-{
-    vec4 color = gfo1 * u1.rgrg * u2.rgbr * u3.rgba;        // o1 is statically used
-    outColor = color;
-}
-