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

fusl/include/mntent.h

Index: fusl/include/mntent.h
diff --git a/fusl/include/mntent.h b/fusl/include/mntent.h
new file mode 100644
index 0000000000000000000000000000000000000000..d03c414a2b069d7701f285320767fbe67522093a
--- /dev/null
+++ b/fusl/include/mntent.h
@@ -0,0 +1,44 @@
+#ifndef _MNTENT_H
+#define _MNTENT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define __NEED_FILE
+#include <bits/alltypes.h>
+
+#define MOUNTED "/etc/mtab"
+
+#define MNTTYPE_IGNORE	"ignore"
+#define MNTTYPE_NFS	"nfs"
+#define MNTTYPE_SWAP	"swap"
+#define MNTOPT_DEFAULTS	"defaults"
+#define MNTOPT_RO	"ro"
+#define MNTOPT_RW	"rw"
+#define MNTOPT_SUID	"suid"
+#define MNTOPT_NOSUID	"nosuid"
+#define MNTOPT_NOAUTO	"noauto"
+
+struct mntent
+{
+	char *mnt_fsname;
+	char *mnt_dir;
+	char *mnt_type;
+	char *mnt_opts;
+	int mnt_freq;
+	int mnt_passno;
+};
+
+FILE *setmntent(const char *, const char *);
+int endmntent(FILE *);
+struct mntent *getmntent(FILE *);
+struct mntent *getmntent_r(FILE *, struct mntent *, char *, int);
+int addmntent(FILE *, const struct mntent *);
+char *hasmntopt(const struct mntent *, const char *);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif