[Toybox] [PATCH] devmem: add --no-sync option.

[enh]

Although O_SYNC is what you want 99% of the time, there is also a use
for not supplying the flag. See drivers/char/mem.c's uncached_access().

The big question here is probably the bikeshed issue of whether to name
the option after what it does (disable the O_SYNC flag) or _why_ you're
doing that. I opted for the former on the basis of "given the -f
argument, you're not necessarily talking to the /dev/mem driver, and
other drivers might use this for other things", even though I'm not
aware of any such driver personally. (Also, it's the shorter name!)
---
 toys/other/devmem.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)
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