change srtp_cipher_encrypt to append the tag generated #190

Job	Run time
build (ubuntu-latest, internal)	33s
build (ubuntu-latest, openssl)	44s
build (ubuntu-latest, wolfssl)	2m 14s
build (ubuntu-latest, nss)	57s
build (ubuntu-latest, mbedtls)	48s
build (macos-12, internal)	41s
build (macos-12, openssl)	1m 2s
build (macos-12, openssl3)	1m 6s
build (macos-12, wolfssl)	3m 13s
build (macos-12, nss)	1m 7s
build (macos-12, mbedtls)	1m 10s
build (windows-latest, internal)	2m 24s
	15m 59s

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