fix windows build

Belonging to [master]:
  - #2127

Author: adrpo

SimulationRuntime/c/util/omc_msvc.h

@@ -184,7 +184,7 @@ static OMC_INLINE int dladdr(void *addr, Dl_info *info) {
 
 #if defined(_MSC_VER)
 
-#include <win32_dirent.h>
+#include <windows.h>
 #if !defined(PATH_MAX)
 #define PATH_MAX MAX_PATH
 #endif

SimulationRuntime/c/util/utility.c

@@ -151,7 +151,12 @@ void OpenModelica_updateUriMapping(threadData_t *threadData, void *namesAndDirs)
 }
 
 #include <sys/stat.h>
+
+#if defined(_MSC_VER)
+#define stat _stat
+#else
 #include <unistd.h>
+#endif
 
 static const char *PATH_NOT_IN_FMU_RESOURCES = "Returning path (%s) not in the resources directory. The FMU might not work as expected if you send it to a different system";