[FS#493] strongSwan no known IPsec stack detected since switch to kernel 4.9

[LEDE Bugs]

The following task has a new comment added:

FS#493 - strongSwan no known IPsec stack detected since switch to kernel 4.9
User who did this - Baptiste Jonglez (bjonglez)

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This looks very similar to FS#443.  yousong, do you have any idea?
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=493#comment1729