[FS#436] asterisk13: Build fails with SRTP (lede)

[LEDE Bugs]

The following task has a new comment added:

FS#436 - asterisk13: Build fails with SRTP (lede)
User who did this - schoerg (schoerg)

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I know it needs to fixed in telephony, but nobody is responding there.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=436#comment1455