Small change for ls

[Loïc Grenié]

I've done the following for the ls applet:

1) Correct a typo in the toplevel Makefile
2) Correct a type in ls.c
3) Change the option checking: removed the
if (flags & ..._TRIGGER) all_fmt &= ..._MASK;
and changed them to a precompiled table, single &, single |.

Effect: -4bytes on .o (i386), 0 bytes on executable. Side effect:
1<<31 is available for another option if needed.

Feel free to include in the source code or to flame appropriately.

Loïc Grenié
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