crypto: remove outdated variant of ChaCha20Poly1305 AEAD

Remove the variant of ChaCha20Poly1305 AEAD that was previously added in
anticipation of BIP324 using it. BIP324 was updated to instead use rekeying
wrappers around otherwise unmodified versions of the ChaCha20 stream cipher
and the ChaCha20Poly1305 AEAD as specified in RFC8439.

Author: sipa

src/Makefile.am

@@ -546,8 +546,6 @@ crypto_libbitcoin_crypto_base_la_LDFLAGS = $(AM_LDFLAGS) -static
 crypto_libbitcoin_crypto_base_la_SOURCES = \
   crypto/aes.cpp \
   crypto/aes.h \
-  crypto/chacha_poly_aead.h \
-  crypto/chacha_poly_aead.cpp \
   crypto/chacha20.h \
   crypto/chacha20.cpp \
   crypto/common.h \

src/Makefile.bench.include

@@ -22,7 +22,6 @@ bench_bench_bitcoin_SOURCES = \
   bench/block_assemble.cpp \
   bench/ccoins_caching.cpp \
   bench/chacha20.cpp \
-  bench/chacha_poly_aead.cpp \
   bench/checkblock.cpp \
   bench/checkqueue.cpp \
   bench/crypto_hash.cpp \

src/Makefile.test.include

@@ -261,7 +261,6 @@ test_fuzz_fuzz_SOURCES = \
  test/fuzz/crypto_aes256.cpp \
  test/fuzz/crypto_aes256cbc.cpp \
  test/fuzz/crypto_chacha20.cpp \
- test/fuzz/crypto_chacha20_poly1305_aead.cpp \
  test/fuzz/crypto_common.cpp \
  test/fuzz/crypto_diff_fuzz_chacha20.cpp \
  test/fuzz/crypto_hkdf_hmac_sha256_l32.cpp \