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

Test/vk.relaxed.link2.frag

@@ -1,19 +0,0 @@
-#version 460
-
-// default uniforms will be gathered into a uniform block
-// final global block will merge uniforms from all linked files
-uniform vec4 a;     // declared in both stages
-uniform vec2 b2;    // declaration order swapped in other stage
-uniform vec2 b1;
-uniform vec4 c2;    // not delcared in other file
-uniform vec4 d;
-
-layout (binding = 0) uniform atomic_uint counter3;
-layout (binding = 0) uniform atomic_uint counter2;
-
-vec4 foo() {
-    uint j = atomicCounterIncrement(counter2) + atomicCounterDecrement(counter3);
-    vec4 v = a + vec4(b1.x, b1.y, b2.x, b2.y) + c2 + d;
-
-    return float(j) * v;
-}