Fix definition of print_scan() function

Builds on Copr and OBS were failing because `print_scan()` function
definition was not prefixed with `static_fn`.

src/cmd/ksh93/bltins/typeset.c

@@ -841,7 +841,7 @@ static_fn void print_attribute(Namval_t *np, void *data) {
 // Print the nodes in tree <root> which have attributes <flag> set of <option> is non-zero, no
 // subscript or value is printed.
 //
-void print_scan(Sfio_t *file, nvflag_t flag, Dt_t *root, bool omit_attrs, struct tdata *tp) {
+static_fn void print_scan(Sfio_t *file, nvflag_t flag, Dt_t *root, bool omit_attrs, struct tdata *tp) {
     char **argv;
     Namval_t *np;
     int namec;