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

fusl/src/unistd/link.c

Index: fusl/src/unistd/link.c
diff --git a/fusl/src/unistd/link.c b/fusl/src/unistd/link.c
new file mode 100644
index 0000000000000000000000000000000000000000..feec18e533d9595a2f37dd7fc8005b37c79b60ed
--- /dev/null
+++ b/fusl/src/unistd/link.c
@@ -0,0 +1,12 @@
+#include <unistd.h>
+#include <fcntl.h>
+#include "syscall.h"
+
+int link(const char *existing, const char *new)
+{
+#ifdef SYS_link
+	return syscall(SYS_link, existing, new);
+#else
+	return syscall(SYS_linkat, AT_FDCWD, existing, AT_FDCWD, new, 0);
+#endif
+}