Fix compilation error on OSX for vmap extractor.

mkdir(path) for windows
mkdir(path, mode) for other os.

I also added a couple of other fix that may cause some issue on OSX.
For this i consider OSX an "linux" like OS. It may work in 90% of the
cases.

contrib/vmap_extractor/vmapextract/loadlib/loadlib.h

@@ -31,9 +31,9 @@ typedef unsigned __int8    uint8;
 #else
 #include <stdint.h>
 #ifndef uint64_t
-#ifdef __linux__
-#include <linux/types.h>
-#endif
+  #ifndef _WIN32
+    #include <linux/types.h>
+  #endif
 #endif
 typedef int64_t            int64;
 typedef int32_t            int32;

contrib/vmap_extractor/vmapextract/vmapexport.cpp

@@ -291,7 +291,7 @@ bool scan_patches(char* scanmatch, std::vector<std::string>& pArchiveNames)
         {
             sprintf(path, "%s.MPQ", scanmatch);
         }
-#ifdef __linux__
+#ifndef _WIN32
         if (FILE* h = fopen64(path, "rb"))
 #else
         if (FILE* h = fopen(path, "rb"))
@@ -478,7 +478,7 @@ int main(int argc, char** argv)
     //xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
     // Create the working directory
     if (mkdir(szWorkDirWmo
-#ifdef __linux__
+#ifndef _WIN32
               , 0711
 #endif
              ))