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

fusl/src/stdio/fputws.c

Index: fusl/src/stdio/fputws.c
diff --git a/fusl/src/stdio/fputws.c b/fusl/src/stdio/fputws.c
new file mode 100644
index 0000000000000000000000000000000000000000..0ed02f1c004e8622e0d4367116a60f22e249720f
--- /dev/null
+++ b/fusl/src/stdio/fputws.c
@@ -0,0 +1,29 @@
+#include "stdio_impl.h"
+#include "locale_impl.h"
+#include <wchar.h>
+
+int fputws(const wchar_t *restrict ws, FILE *restrict f)
+{
+	unsigned char buf[BUFSIZ];
+	size_t l=0;
+	locale_t *ploc = &CURRENT_LOCALE, loc = *ploc;
+
+	FLOCK(f);
+
+	fwide(f, 1);
+	*ploc = f->locale;
+
+	while (ws && (l = wcsrtombs((void *)buf, (void*)&ws, sizeof buf, 0))+1 > 1)
+		if (__fwritex(buf, l, f) < l) {
+			FUNLOCK(f);
+			*ploc = loc;
+			return -1;
+		}
+
+	FUNLOCK(f);
+
+	*ploc = loc;
+	return l; /* 0 or -1 */
+}
+
+weak_alias(fputws, fputws_unlocked);