ls: port to Oracle Developer Studio 12.6

ls: port to Oracle Developer Studio 12.6

Oracle Developer Studio 12.6 for sparc mishandles
‘sizeof ((char []) {'x', 'y'})’: it says
“warning: null dimension: sizeof()” and then generates
the wrong length in data.  Work around the compiler bug
by counting sizes by hand, which may be a bit clearer anyway,
if a bit more error-prone.
* src/ls.c (BIN_STR): Remove.
(color_indicator): Spell out instead of using BIN_STR.