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

fusl/src/ctype/iswprint.c

+#include <wctype.h>
+#include "libc.h"
+
+/* Consider all legal codepoints as printable except for:
+ * - C0 and C1 control characters
+ * - U+2028 and U+2029 (line/para break)
+ * - U+FFF9 through U+FFFB (interlinear annotation controls)
+ * The following code is optimized heavily to make hot paths for the
+ * expected printable characters. */
+
+int iswprint(wint_t wc)
+{
+        if (wc < 0xffU)
+                return (wc+1 & 0x7f) >= 0x21;
+        if (wc < 0x2028U || wc-0x202aU < 0xd800-0x202a || wc-0xe000U < 0xfff9-0xe000)
+                return 1;
+        if (wc-0xfffcU > 0x10ffff-0xfffc || (wc&0xfffe)==0xfffe)
+                return 0;
+        return 1;
+}
+
+int __iswprint_l(wint_t c, locale_t l)
+{
+        return iswprint(c);
+}
+
+weak_alias(__iswprint_l, iswprint_l);