meson: add ability to configure libsrtp2 crypto library (defaulting to mbedtls) #6
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This was upstreamed to cisco/libsrtp2 so now it's very easy. cisco/libsrtp#660
Preliminary testing showed similar performance for OpenSSL and mbedtls, and mbedtls is already a Meson subproject, so we may as well just use this. Both OpenSSL and mbedtls were around twice as performant as the built-in libsrtp2 crypto functions.