change srtp_cipher_encrypt to append the tag generated #193

Job	Run time
build (ubuntu-latest, internal)	31s
build (ubuntu-latest, openssl)	59s
build (ubuntu-latest, wolfssl)	2m 4s
build (ubuntu-latest, nss)	55s
build (ubuntu-latest, mbedtls)	56s
build (macos-12, internal)	44s
build (macos-12, openssl)	1m 0s
build (macos-12, openssl3)	1m 4s
build (macos-12, wolfssl)	3m 0s
build (macos-12, nss)	1m 6s
build (macos-12, mbedtls)	1m 2s
build (windows-latest, internal)	2m 28s
	15m 49s

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