ls: handle -p and -F through option_mask32

ls: handle -p and -F through option_mask32

function                                             old     new   delta
display_single                                      1039    1044      +5
append_char                                           67      68      +1
display_files                                        399     396      -3
scan_and_display_dirs_recur                          545     541      -4
ls_main                                              736     722     -14
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/3 up/down: 6/-21)             Total: -15 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>