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

fusl/src/signal/sigqueue.c

Index: fusl/src/signal/sigqueue.c
diff --git a/fusl/src/signal/sigqueue.c b/fusl/src/signal/sigqueue.c
new file mode 100644
index 0000000000000000000000000000000000000000..b75f0c5cea42f7f03a23ef3f130d1c507f8c2df4
--- /dev/null
+++ b/fusl/src/signal/sigqueue.c
@@ -0,0 +1,22 @@
+#include <signal.h>
+#include <string.h>
+#include <unistd.h>
+#include "syscall.h"
+#include "pthread_impl.h"
+
+int sigqueue(pid_t pid, int sig, const union sigval value)
+{
+	siginfo_t si;
+	sigset_t set;
+	int r;
+	memset(&si, 0, sizeof si);
+	si.si_signo = sig;
+	si.si_code = SI_QUEUE;
+	si.si_value = value;
+	si.si_uid = getuid();
+	__block_app_sigs(&set);
+	si.si_pid = getpid();
+	r = syscall(SYS_rt_sigqueueinfo, pid, sig, &si);
+	__restore_sigs(&set);
+	return r;
+}