glsl: Enable GLSL ES 3.00 features inherited from desktop GLSL.

This patch turns on the following features for GLSL ES 3.00:

- Array constructors, whole array assignment, and array comparisons.
- Second and third operands of ?: may be arrays.
- Use of "in" and "out" qualifiers on globals.
- Bitwise and modulus operators.
- Integral vertex shader inputs.
- Range-checking of literal integers.
- array.length method.
- Function calls may be constant expressions.
- Integral varyings must be qualified with "flat".
- Interpolation and centroid qualifiers may not be applied to vertex
  shader inputs.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Acked-by: Carl Worth <cworth@cworth.org>

src/glsl/hir_field_selection.cpp

@@ -72,7 +72,7 @@ _mesa_ast_field_selection_to_hir(const ast_expression *expr,
       }
    } else if (expr->subexpressions[1] != NULL) {
       /* Handle "method calls" in GLSL 1.20 - namely, array.length() */
-      state->check_version(120, 0, &loc, "Methods not supported");
+      state->check_version(120, 300, &loc, "Methods not supported");
 
       ast_expression *call = expr->subexpressions[1];
       assert(call->oper == ast_function_call);