[Toybox] [PATCH] Make find -exec + obey ARG_MAX just like xargs.

[enh]

This isn't ideal, but it matches xargs and none of us is likely to have
time to do the best possible thing any time soon.

Bug: http://b/65818597
Test: ./toybox find /usr/local/google/ndkports/ -exec echo {} +
---
 toys/posix/find.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
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