Add a "fork" of musl as //fusl.

fusl/src/dirent/opendir.c

Index: fusl/src/dirent/opendir.c
diff --git a/fusl/src/dirent/opendir.c b/fusl/src/dirent/opendir.c
new file mode 100644
index 0000000000000000000000000000000000000000..5cb84e303feea1746c64e3b255bd7fe76389e49b
--- /dev/null
+++ b/fusl/src/dirent/opendir.c
@@ -0,0 +1,21 @@
+#define _GNU_SOURCE
+#include <dirent.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include "__dirent.h"
+#include "syscall.h"
+
+DIR *opendir(const char *name)
+{
+	int fd;
+	DIR *dir;
+
+	if ((fd = open(name, O_RDONLY|O_DIRECTORY|O_CLOEXEC)) < 0)
+		return 0;
+	if (!(dir = calloc(1, sizeof *dir))) {
+		__syscall(SYS_close, fd);
+		return 0;
+	}
+	dir->fd = fd;
+	return dir;
+}