mruby-dir/dirtest.c: copy some of dirent header information
Instead of including whole "dirent.c" file.
MODIFY
mrbgems/mruby-dir/test/dirtest.c
mrbgems/mruby-dir/test/dirtest.c
#include <string.h>
#if defined(_WIN32) || defined(_WIN64)
-#include "../src/Win/dirent.c"
+typedef struct DIR DIR;
+struct dirent
+{
+ char *d_name;
+};
+DIR *opendir(const char *name);
+struct dirent *readdir(DIR *dir);
+int closedir(DIR *dir);
#include <direct.h>
#define rmdir(path) _rmdir(path)
#define mkdir(path,mode) _mkdir(path)

mruby-dir/dirtest.c: copy some of dirent header information

Instead of including whole "dirent.c" file.