Move all C++ tests to cpp.

cpp/long_long_size.cpp

@@ -0,0 +1,10 @@
+#include <iostream>
+
+int main ( void )
+{
+	std::cout << "sizeof(long) = " << sizeof( long ) << std::endl;
+	std::cout << "sizeof(long long) = " << sizeof( long long ) << std::endl;
+
+	return 0;
+}
+