[ISSUE] Add support for pkcs11 in strongswan

[ISSUE] Add support for pkcs11 in strongswan

[kotoko]

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New issue by kotoko on void-packages repository

https://github.com/void-linux/void-packages/issues/42811

Description:
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I have working vpn configuration using certificate that is stored on smartcard on linux mint. I am trying to setup same vpn on void linux. I think the problem is in strongswan that does not have plugin enabled. When I looked at [1] I see there is no plugin `pkcs11` enabled. According to [2] it is necessary to add option `--enable-pkcs11` before compilation.

Please add support for pkcs11 in strongswan.

[1] https://raw.githubusercontent.com/void-linux/void-packages/e21993428f6776a1730f92f23a3189c7c13becc8/srcpkgs/strongswan/template
[2] https://docs.strongswan.org/docs/5.9/plugins/pkcs11.html