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

fusl/src/time/timer_delete.c

Index: fusl/src/time/timer_delete.c
diff --git a/fusl/src/time/timer_delete.c b/fusl/src/time/timer_delete.c
new file mode 100644
index 0000000000000000000000000000000000000000..7c97eeb1a1d8340fd07f9f045f1964680a18697d
--- /dev/null
+++ b/fusl/src/time/timer_delete.c
@@ -0,0 +1,14 @@
+#include <time.h>
+#include <limits.h>
+#include "pthread_impl.h"
+
+int timer_delete(timer_t t)
+{
+	if ((intptr_t)t < 0) {
+		pthread_t td = (void *)((uintptr_t)t << 1);
+		a_store(&td->timer_id, td->timer_id | INT_MIN);
+		__wake(&td->timer_id, 1, 1);
+		return 0;
+	}
+	return __syscall(SYS_timer_delete, t);
+}