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

fusl/src/sched/sched_get_priority_max.c

Index: fusl/src/sched/sched_get_priority_max.c
diff --git a/fusl/src/sched/sched_get_priority_max.c b/fusl/src/sched/sched_get_priority_max.c
new file mode 100644
index 0000000000000000000000000000000000000000..30ae5100e1de4e5f863f16c131279851be3fbca5
--- /dev/null
+++ b/fusl/src/sched/sched_get_priority_max.c
@@ -0,0 +1,12 @@
+#include <sched.h>
+#include "syscall.h"
+
+int sched_get_priority_max(int policy)
+{
+	return syscall(SYS_sched_get_priority_max, policy);
+}
+
+int sched_get_priority_min(int policy)
+{
+	return syscall(SYS_sched_get_priority_min, policy);
+}