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

fusl/src/stdio/wscanf.c

Index: fusl/src/stdio/wscanf.c
diff --git a/fusl/src/stdio/wscanf.c b/fusl/src/stdio/wscanf.c
new file mode 100644
index 0000000000000000000000000000000000000000..80412252346d30021b60674641c3d4044834cd64
--- /dev/null
+++ b/fusl/src/stdio/wscanf.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <stdarg.h>
+#include <wchar.h>
+#include "libc.h"
+
+int wscanf(const wchar_t *restrict fmt, ...)
+{
+	int ret;
+	va_list ap;
+	va_start(ap, fmt);
+	ret = vwscanf(fmt, ap);
+	va_end(ap);
+	return ret;
+}
+
+weak_alias(wscanf,__isoc99_wscanf);