move llist_find_str from modutils to libbb

modutils/modutils.h

@@ -18,7 +18,6 @@ PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
 #define MODULE_NAME_LEN 256
 
 const char *moderror(int err) FAST_FUNC;
-llist_t *llist_find(llist_t *first, const char *str) FAST_FUNC;
 void replace(char *s, char what, char with) FAST_FUNC;
 char *replace_underscores(char *s) FAST_FUNC;
 int string_to_llist(char *string, llist_t **llist, const char *delim) FAST_FUNC;