[Toybox] [PATCH] xargs: fix -E.

[enh]

89a8d00e470f1999a62ceea81269af2f39c655ba broke -E by switching to a
prefix match. Add the missing test and fix the bug, but caching the
length of the -E argument because the call to strlen(3) on every single
piece of input presumably motivated the change that introduced the bug.
---
 tests/xargs.test   | 2 +-
 toys/posix/xargs.c | 6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)
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