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

fusl/src/linux/cap.c

Index: fusl/src/linux/cap.c
diff --git a/fusl/src/linux/cap.c b/fusl/src/linux/cap.c
new file mode 100644
index 0000000000000000000000000000000000000000..8d035e07a4c97896e4fbadfd76ba79a40e1a8ea0
--- /dev/null
+++ b/fusl/src/linux/cap.c
@@ -0,0 +1,11 @@
+#include "syscall.h"
+
+int capset(void *a, void *b)
+{
+	return syscall(SYS_capset, a, b);
+}
+
+int capget(void *a, void *b)
+{
+	return syscall(SYS_capget, a, b);
+}