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

Test/iomap.crossStage.2.geom

@@ -1,39 +0,0 @@
-#version 460
-
-layout(points) in;
-layout(triangle_strip, max_vertices=3) out;
-
-in vec4 vgo1[];
-in vec2 vgo2[];
-
-layout(location = 5) in outBlock {
-    vec4 o3;
-} inBlock[];
-
-out vec4 gfo1;
-out vec2 gfo2;
-
-layout(location = 5) out outBlock {
-    vec4 o3;
-} gf_out;
-
-uniform vec2 u1;
-uniform vec3 u2 = vec3(0); // initializer not present in fragment stage
-uniform vec4 u3 = vec4(0); // initializer matches initializer in fragment stage
-
-uniform crossStageBlock2 {
-    uniform vec4 a;
-    vec2 b;
-} blockName1 [2]; // instance name different from frag
-
-void main()
-{
-    for (int i = 0; i < 3; i++) {
-        gfo1 = vec4(0);
-        gfo2 = vec2(0);
-        gf_out.o3 = inBlock[i].o3;
-        EmitVertex();
-    }
-    EndPrimitive();
-}
-