Update the array tests to not use a local type; removes warnings in C++03. NFC

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@344417 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/containers/sequences/array/begin.pass.cpp

@@ -18,6 +18,10 @@
 // Disable the missing braces warning for this reason.
 #include "disable_missing_braces_warning.h"
 
+struct NoDefault {
+  NoDefault(int) {}
+};
+
 
 int main()
 {
@@ -33,9 +37,6 @@ int main()
         assert(c[0] == 5.5);
     }
     {
-      struct NoDefault {
-        NoDefault(int) {}
-      };
       typedef NoDefault T;
       typedef std::array<T, 0> C;
       C c = {};