[FS#1510] busybox conflicts with flock

[LEDE Bugs]

The following task has a new comment added:

FS#1510 - busybox conflicts with flock
User who did this - Yousong Zhou (yousong)

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Please test whether the changes at flock-alt branch of my staging tree [1] can fix the issue.  Thank you

 [1] https://git.openwrt.org/?p=openwrt/staging/yousong.git;a=shortlog;h=refs/heads/flock-alt
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1510#comment4688