Handle non-consecutive tag numbers in Sigma3 certificate extensions #106

Job	Run time
build_and_test (rustcrypto, stable)	1m 20s
build_and_test (rustcrypto, nightly)	1m 38s
build_and_test (rustcrypto, alloc, stable)	1m 47s
build_and_test (rustcrypto, alloc, nightly)	1m 22s
build_and_test (rustcrypto, os, stable)	3m 11s
build_and_test (rustcrypto, os, nightly)	2m 49s
build_and_test (mbedtls, stable)	2m 2s
build_and_test (mbedtls, nightly)	1m 49s
build_and_test (mbedtls, alloc, stable)	1m 38s
build_and_test (mbedtls, alloc, nightly)	1m 40s
build_and_test (mbedtls, os, stable)	2m 52s
build_and_test (mbedtls, os, nightly)	3m 14s
build_and_test (openssl, stable)	1m 11s
build_and_test (openssl, nightly)	1m 30s
build_and_test (openssl, alloc, stable)	1m 25s
build_and_test (openssl, alloc, nightly)	1m 10s
build_and_test (openssl, os, stable)	2m 24s
build_and_test (openssl, os, nightly)	2m 40s
	35m 42s

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