[Toybox] [PATCH] xparsedate: support UTC offsets.

[enh]

Requested in https://github.com/landley/toybox/issues/130, quoting an
old version of the toybox help. This is also supported by coreutils.

Set $LANG to C in the date tests so that they pass with TEST_HOST=1
(they were already failing for me, presumably related to a newer glibc).
---
 lib/xwrap.c       | 48 +++++++++++++++++++++++++++++++++++++----------
 tests/date.test   | 10 ++++++++++
 toys/posix/date.c |  3 +++
 3 files changed, 51 insertions(+), 10 deletions(-)
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