Adds default visibility specifier to syntax tests.

test/libsolidity/syntaxTests/array/length/array_length_cannot_be_constant_function_parameter.sol

@@ -1,7 +1,7 @@
 contract C {
-    function f(uint constant LEN) {
+    function f(uint constant LEN) public {
         uint[LEN] a;
     }
 }
 // ----
-// TypeError: (62-65): Invalid array length, expected integer literal or constant expression.
+// TypeError: (69-72): Invalid array length, expected integer literal or constant expression.

test/libsolidity/syntaxTests/array/length/cannot_be_function.sol

@@ -1,6 +1,6 @@
 contract C {
-    function f() {}
+    function f() public {}
     uint[f] ids;
 }
 // ----
-// TypeError: (42-43): Invalid array length, expected integer literal or constant expression.
+// TypeError: (49-50): Invalid array length, expected integer literal or constant expression.

test/libsolidity/syntaxTests/array/length/cannot_be_function_call.sol

@@ -1,7 +1,7 @@
 contract C {
-    function f(uint x) {}
+    function f(uint x) public {}
     uint constant LEN = f();
     uint[LEN] ids;
 }
 // ----
-// TypeError: (77-80): Invalid array length, expected integer literal or constant expression.
+// TypeError: (84-87): Invalid array length, expected integer literal or constant expression.

test/libsolidity/syntaxTests/array/length/complex_cyclic_constant.sol

@@ -2,7 +2,7 @@ contract C {
     uint constant L2 = LEN - 10;
     uint constant L1 = L2 / 10;
     uint constant LEN = 10 + L1 * 5;
-    function f() {
+    function f() public {
         uint[LEN] a;
     }
 }

test/libsolidity/syntaxTests/array/length/cyclic_constant.sol

@@ -1,6 +1,6 @@
 contract C {
     uint constant LEN = LEN;
-    function f() {
+    function f() public {
         uint[LEN] a;
     }
 }