[FS#512] uhttpd.init generates certificate with sha1 signature

[LEDE Bugs]

The following task has a new comment added:

FS#512 - uhttpd.init generates certificate with sha1 signature
User who did this - Felix Fietkau (nbd)

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On this image, did you have openssl installed? px5g-mbedtls should already use SHA256.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=512#comment1850