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

fusl/include/paths.h

+#ifndef _PATHS_H
+#define _PATHS_H
+
+#define _PATH_DEFPATH "/usr/local/bin:/bin:/usr/bin"
+#define _PATH_STDPATH "/bin:/usr/bin:/sbin:/usr/sbin"
+
+#define _PATH_BSHELL    "/bin/sh"
+#define _PATH_CONSOLE   "/dev/console"
+#define _PATH_DEVNULL   "/dev/null"
+#define _PATH_KLOG      "/proc/kmsg"
+#define _PATH_LASTLOG   "/var/log/lastlog"
+#define _PATH_MAILDIR   "/var/mail"
+#define _PATH_MAN       "/usr/share/man"
+#define _PATH_MNTTAB    "/etc/fstab"
+#define _PATH_MOUNTED   "/etc/mtab"
+#define _PATH_NOLOGIN   "/etc/nologin"
+#define _PATH_SENDMAIL  "/usr/sbin/sendmail"
+#define _PATH_SHADOW    "/etc/shadow"
+#define _PATH_SHELLS    "/etc/shells"
+#define _PATH_TTY       "/dev/tty"
+#define _PATH_UTMP      "/dev/null/utmp"
+#define _PATH_VI        "/usr/bin/vi"
+#define _PATH_WTMP      "/dev/null/wtmp"
+
+#define _PATH_DEV       "/dev/"
+#define _PATH_TMP       "/tmp/"
+#define _PATH_VARDB     "/var/lib/misc/"
+#define _PATH_VARRUN    "/var/run/"
+#define _PATH_VARTMP    "/var/tmp/"
+
+#endif