fix ticket:4509, use correct defines on Windows

Author: adrpo

Compiler/runtime/systemimpl.c

@@ -355,7 +355,7 @@ static char* SystemImpl__readFile(const char* filename)
   }
 
   /* adrpo: if size is larger than the max string, return a different string */
-#ifndef _LP64
+#if !(defined(_LP64) || defined(_LLP64) || defined(_WIN64) || defined(__MINGW64__))
   if (statstr.st_size > (pow((double)2, (double)22) * 4)) {
     const char *c_tokens[1]={filename};
     c_add_message(NULL,85, /* ERROR_OPENING_FILE */

SimulationRuntime/c/meta/meta_modelica_data.h

@@ -63,7 +63,7 @@
  * - 2^(32-10) + 1 (header) on 32 bit systems
  * - 2^(64-10) + 1 (header) on 64 bit systems
  */
-#if defined(_LP64) || defined(_LLP64) || defined(_WIN64)
+#if defined(_LP64) || defined(_LLP64) || defined(_WIN64) || defined(__MINGW64__)
 #define MMC_MAX_SLOTS (18014398509481984) /* max words slots header */
 #else
 #define MMC_MAX_SLOTS (4194304)           /* max words slots header */