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

fusl/src/linux/ppoll.c

Index: fusl/src/linux/ppoll.c
diff --git a/fusl/src/linux/ppoll.c b/fusl/src/linux/ppoll.c
new file mode 100644
index 0000000000000000000000000000000000000000..9e262477ba93de416a3498f71f6eb2e75a059eec
--- /dev/null
+++ b/fusl/src/linux/ppoll.c
@@ -0,0 +1,10 @@
+#define _GNU_SOURCE
+#include <poll.h>
+#include <signal.h>
+#include "syscall.h"
+
+int ppoll(struct pollfd *fds, nfds_t n, const struct timespec *to, const sigset_t *mask)
+{
+	return syscall_cp(SYS_ppoll, fds, n,
+		to ? (struct timespec []){*to} : 0, mask, _NSIG/8);
+}