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

fusl/include/shadow.h

+#ifndef _SHADOW_H
+#define _SHADOW_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define __NEED_FILE
+#define __NEED_size_t
+
+#include <bits/alltypes.h>
+
+#define SHADOW "/etc/shadow"
+
+struct spwd {
+        char *sp_namp;
+        char *sp_pwdp;
+        long sp_lstchg;
+        long sp_min;
+        long sp_max;
+        long sp_warn;
+        long sp_inact;
+        long sp_expire;
+        unsigned long sp_flag;
+};
+
+void setspent(void);
+void endspent(void);
+struct spwd *getspent(void);
+struct spwd *fgetspent(FILE *);
+struct spwd *sgetspent(const char *);
+int putspent(const struct spwd *, FILE *);
+
+struct spwd *getspnam(const char *);
+int getspnam_r(const char *, struct spwd *, char *, size_t, struct spwd **);
+
+int lckpwdf(void);
+int ulckpwdf(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif