[Toybox] More find cleanup

[Felix Janda]

Hello,

some more find cleanup in an attached patch.

The main change was to make some code in build_filter_list() less
repetitive using a suitable struct and a loop. The command line parsing
is however now less efficient since after an argument has been tested
for equality with different strings like "-mtime" and the corresponding
type (CHECK_MTIME) has been saved, the saved integer has again to be
checked for equality with stuff to find out what further command line
parsing is necessary.

Apart from this I moved around some variables and got rid of the
unnecessary index "i" in build_filter_list().

Felix

BTW: POSIX-1.2008 TC1 is out
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