strongswan: dependencies hell

Maintainer: @pprindeville
Environment: (OpenWrt 23.05.0-rc3)

Description:

1. I believe strongswan packages (both full and default) should depend on kmod-xfrm-interface package.
Without it I get error in logread:

daemon.info ipsec: 00[KNL] received netlink error: Unknown device type (95)
daemon.info ipsec: 00[KNL] failed to create XFRM interface 'xfrmi-test-6147'

2. Same can be said about strongswan-mod-drbg (results in non-functional setup if strongswan-default is installed)

3. strongswan-full should include strongswan-mod-gmpdh in its dependencies too or user will get:

plugin 'gmpdh': failed to load - gmpdh_plugin_create not found and no plugin file available

4. I believe strongswan-mod-wolfssl is broken because of wolfSSL version mismatch.
I get:

plugin 'wolfssl' failed to load: Error relocating /usr/lib/ipsec/plugins/libstrongswan-wolfssl.so: wolfssl_ec_diffie_hellman_create: symbol not found

Start by reviewing the strongswan, strongswan-default, strongswan-full, strongswan-mod-drbg, strongswan-mod-gmpdh, and strongswan-mod-wolfssl package definitions and their declared dependencies. Reproduce the reported XFRM, gmpdh, and wolfSSL errors on OpenWrt 23.05.0-rc3, then verify the dependency fixes and wolfSSL compatibility resolve them.