include windows.h where Driver.cpp calls CreateDirectory

The _WIN32 branch of the physics-log setup calls a Win32 API the file
never included; Linux takes the mkdir branch, so it never showed up
locally. Swept the tree for the same shape - Win32 calls inside _WIN32
blocks without windows.h - and this was the only one.

vehicle/Driver.cpp

@@ -12,6 +12,9 @@ module;
 #include <list>
 #include <optional>
 #include <sys/stat.h>
+#ifdef _WIN32
+#include <windows.h>   // CreateDirectory, in the _WIN32 branch of the log setup
+#endif
 #include <cstdint>
 #include <algorithm>
 #include <array>