py/unicode: Comment-out unused function unichar_isprint.

py/unicode.c

@@ -133,9 +133,11 @@ bool unichar_isalpha(unichar c) {
     return c < 128 && (attr[c] & FL_ALPHA) != 0;
 }
 
+/* unused
 bool unichar_isprint(unichar c) {
     return c < 128 && (attr[c] & FL_PRINT) != 0;
 }
+*/
 
 bool unichar_isdigit(unichar c) {
     return c < 128 && (attr[c] & FL_DIGIT) != 0;