Make sure file is not modified before using the cache

Belonging to [master]:
  - #3017

Author: adeas31

Compiler/runtime/SimulationResults.c

@@ -9,9 +9,12 @@
 #include <math.h>
 #include <gc.h>
 #include "omc_msvc.h" /* For INFINITY and NAN */
-#if !defined(__MINGW32__) && !defined(_MSC_VER)
 #include <time.h>
+#include <sys/types.h>
 #include <sys/stat.h>
+
+#if defined(__MINGW32__) || defined(_MSC_VER)
+#define stat _stat
 #endif
 
 #if defined(_MSC_VER)
@@ -31,9 +34,7 @@ const char *PlotFormatStr[] = {"Unknown","MATLAB4","PLT","CSV"};
 typedef struct {
   PlotFormat curFormat;
   char *curFileName;
-#if !defined(__MINGW32__) && !defined(_MSC_VER)
   time_t mtime;
-#endif
   ModelicaMatReader matReader;
   FILE *pltReader;
   struct csv_data *csvReader;
@@ -62,18 +63,13 @@ static PlotFormat SimulationResultsImpl__openFile(const char *filename, Simulati
   PlotFormat format;
   int len = strlen(filename);
   const char *msg[] = {"",""};
-#if !defined(__MINGW32__) && !defined(_MSC_VER)
   struct stat buf = {0} /* Zero this or valgrind complains */;
-#endif
+
   if (simresglob->curFileName && 0==strcmp(filename,simresglob->curFileName)) {
-#if defined(__MINGW32__) || defined(_MSC_VER)
-    return simresglob->curFormat; // Super cache :)
-#else
     /* Also check that the file was not modified */
     if (stat(filename, &buf)==0 && difftime(buf.st_mtime,simresglob->mtime)==0.0) {
       return simresglob->curFormat; // Super cache :)
     }
-#endif
   }
   // Start by closing the old file...
   SimulationResultsImpl__close(simresglob);