Locale support enabled breaks fractional usage in sleep applet

[Harald Becker]

 Hi Denys!
> Can you confirm that it errors out here:
Ack. That is my assumption.

> bb_error_msg_and_die("arg:'%s' errno:%d pp:'%s'", arg, errno, pp)
central:busybox-1.17.2> ./busybox sleep 0.5s
sleep: arg:'0.5' errno:0 pp:'.5'
central:busybox-1.17.2> ./busybox sleep 0,5s
sleep: invalid number '0,5s'
central:busybox-1.17.2> ./busybox sleep 0.1m
sleep: arg:'0.1' errno:0 pp:'.1'

> Cannot reproduce. ...
Full config attached.

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