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

fusl/src/unistd/chown.c

Index: fusl/src/unistd/chown.c
diff --git a/fusl/src/unistd/chown.c b/fusl/src/unistd/chown.c
new file mode 100644
index 0000000000000000000000000000000000000000..14b032550d675e6594302a6107c13a599d57443a
--- /dev/null
+++ b/fusl/src/unistd/chown.c
@@ -0,0 +1,12 @@
+#include <unistd.h>
+#include <fcntl.h>
+#include "syscall.h"
+
+int chown(const char *path, uid_t uid, gid_t gid)
+{
+#ifdef SYS_chown
+	return syscall(SYS_chown, path, uid, gid);
+#else
+	return syscall(SYS_fchownat, AT_FDCWD, path, uid, gid, 0);
+#endif
+}