SPV: Require desktop 140 or ES 310 or above.

Test/spv.forwardFun.frag

@@ -1,9 +1,9 @@
-#version 100
+#version 140
 
 precision mediump float;
 
 uniform vec4 bigColor;
-varying vec4 BaseColor;
+in vec4 BaseColor;
 uniform float d;
 
 void bar();