[Toybox] [PATCH] find: add -context.

[enh]

Tested manually on an Android device with:

  adb shell find /system -context u:object_r:wait_for_keymaster_exec:s0
  adb shell find /system/bin -context '"*key*"'
  adb shell find /system/bin -context '"*tool*"'
---
 toys/posix/find.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)
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