Add test for constant array typedef

Author: rsammelson

bindgen-tests/tests/expectations/tests/const_array_typedef.rs

@@ -0,0 +1,13 @@
+typedef struct {
+    int field;
+} strct;
+
+typedef strct typ[1];
+
+extern typ w;
+extern strct *x;
+
+extern const typ y;
+extern const strct *z;
+
+void function(const typ a, const strct *b);