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

fusl/src/mq/mq_open.c

Index: fusl/src/mq/mq_open.c
diff --git a/fusl/src/mq/mq_open.c b/fusl/src/mq/mq_open.c
new file mode 100644
index 0000000000000000000000000000000000000000..aa91d589108fbd05757ba8c04afaa43e8711d743
--- /dev/null
+++ b/fusl/src/mq/mq_open.c
@@ -0,0 +1,19 @@
+#include <mqueue.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include "syscall.h"
+
+mqd_t mq_open(const char *name, int flags, ...)
+{
+	mode_t mode = 0;
+	struct mq_attr *attr = 0;
+	if (*name == '/') name++;
+	if (flags & O_CREAT) {
+		va_list ap;
+		va_start(ap, flags);
+		mode = va_arg(ap, mode_t);
+		attr = va_arg(ap, struct mq_attr *);
+		va_end(ap);
+	}
+	return syscall(SYS_mq_open, name, flags, mode, attr);
+}