Add needed functions to glibc-compat for pkg

ports/glibc-compat/include/sys/dirent.h

Index: ports/glibc-compat/include/sys/dirent.h
diff --git a/ports/glibc-compat/include/sys/dirent.h b/ports/glibc-compat/include/sys/dirent.h
index 726da2ec7fb4635ba8ab84e9ba24829e32c4d6a1..910070d8b5962f5f5ae1d1a04b98350128f4098d 100644
--- a/ports/glibc-compat/include/sys/dirent.h
+++ b/ports/glibc-compat/include/sys/dirent.h
@@ -14,7 +14,13 @@
 __BEGIN_DECLS
 #endif
 
+int dirfd(DIR *dirp);
 int readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result);
+int alphasort(const void *a, const void *b);
+int scandir(const char *dirp, struct dirent ***namelist,
+              int (*filter)(const struct dirent *),
+              int (*compar)(const struct dirent **, const struct dirent **));
+DIR *fdopendir(int fd);
 
 /* Work around a dirent.h wrapping includes in extern "C". */
 #if defined(_DIRENT_H_)