Make it compile with mingw32 again

ansi.c

@@ -157,7 +157,16 @@ long platform_ftell(FILE *stream) {
 }
 
 int platform_mkdir(const char *path, int mode) {
+    /*
+     * For some reason mingw32 just doesn't have a correct mkdir impl
+     * so we handle that here.
+     */
+#   ifdef _WIN32
+    (void)mode;
+    return mkdir(path);
+#   else
     return mkdir(path, mode);
+#   endif /*!_WIN32*/
 }
 
 DIR *platform_opendir(const char *path) {

ftepp.c

@@ -23,12 +23,14 @@
  */
 #include <string.h>
 #include <stdlib.h>
+#include <sys/stat.h>
 
 #include "gmqcc.h"
 #include "lexer.h"
 #include "platform.h"
 
 #define HT_MACROS 1024
+
 typedef struct {
     bool on;
     bool was_on;