unit-allocator.cpp: Silence compiler warning on MSVC 2015

test/src/unit-allocator.cpp

@@ -114,6 +114,7 @@ struct my_allocator : std::allocator<T>
     {
         if (next_destroy_fails)
         {
+            (void)p; // Ignored unused
             next_destroy_fails = false;
             throw std::bad_alloc();
         }

test/src/unit-udt.cpp

@@ -817,7 +817,9 @@ class Evil
   public:
     Evil() = default;
     template <typename T>
-    Evil(T t) : m_i(sizeof(t)) {}
+    Evil(T t) : m_i(sizeof(t)) {
+      (void)t; // Ignored unused
+    }
 
     int m_i = 0;
 };