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

fusl/src/ctype/iswprint.c

Index: fusl/src/ctype/iswprint.c
diff --git a/fusl/src/ctype/iswprint.c b/fusl/src/ctype/iswprint.c
new file mode 100644
index 0000000000000000000000000000000000000000..69856e0d8e3a3e98dec528bae17cd7da8456704b
--- /dev/null
+++ b/fusl/src/ctype/iswprint.c
@@ -0,0 +1,27 @@
+#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);