Fix #1065: don't validate Vulkan binding numbers.

Test/vulkan.vert

@@ -58,3 +58,6 @@ out ban1 {                              // ERROR, only outer dimension
 out ban2 {
     float f;
 } bai2[arraySize][2];
+
+layout(binding = 3000) uniform sampler2D s3000;
+layout(binding = 3001) uniform b3001 { int a; };

glslang/MachineIndependent/ParseHelper.cpp

@@ -4614,7 +4614,7 @@ void TParseContext::layoutTypeCheck(const TSourceLoc& loc, const TType& type)
                 } else
                     lastBinding += type.getCumulativeArraySize();
             }
-            if (lastBinding >= resources.maxCombinedTextureImageUnits)
+            if (spvVersion.vulkan == 0 && lastBinding >= resources.maxCombinedTextureImageUnits)
                 error(loc, "sampler binding not less than gl_MaxCombinedTextureImageUnits", "binding", type.isArray() ? "(using array)" : "");
         }
         if (type.getBasicType() == EbtAtomicUint) {