bitcoin-core: add workaround for libsecp256k1 related build failure

See guidovranken/cryptofuzz#55. A function was removed from libsecp256k1, causing the crypto-fuzz build to fail:
```bash
clang++ -O1 -fno-omit-frame-pointer -gline-tables-only -DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION -fsanitize=address -fsanitize-address-use-after-scope -fsanitize=fuzzer-no-link -stdlib=libc++ -DCRYPTOFUZZ_NO_OPENSSL -I /src/boost_1_74_0/ -DCRYPTOFUZZ_SECP256K1 -DCRYPTOFUZZ_TREZOR_FIRMWARE -DCRYPTOFUZZ_BOTAN -DCRYPTOFUZZ_BOTAN_IS_ORACLE -DCRYPTOFUZZ_BITCOIN -Wall -Wextra -std=c++17 -I include/ -I . -I fuzzing-headers/include -DFUZZING_HEADERS_NO_IMPL driver.o executor.o util.o entry.o tests.o operation.o datasource.o repository.o options.o components.o wycheproof.o crypto.o expmod.o mutator.o z3.o numbers.o mutatorpool.o ecc_diff_fuzzer_importer.o ecc_diff_fuzzer_exporter.o botan_importer.o openssl_importer.o builtin_tests_importer.o bignum_fuzzer_importer.o modules/botan/module.a modules/secp256k1/module.a modules/trezor/module.a modules/bitcoin/module.a -fsanitize=fuzzer third_party/cpu_features/build/libcpu_features.a  -o cryptofuzz
/usr/bin/ld: /usr/bin/ld: DWARF error: invalid or unhandled FORM value: 0x25
modules/secp256k1/module.a(secp256k1_api.o): in function `cryptofuzz_secp256k1_fe_equal_var':
secp256k1_api.c:(.text.cryptofuzz_secp256k1_fe_equal_var[cryptofuzz_secp256k1_fe_equal_var]+0x27): undefined reference to `secp256k1_fe_equal_var'
/usr/bin/ld: secp256k1_api.c:(.text.cryptofuzz_secp256k1_fe_equal_var[cryptofuzz_secp256k1_fe_equal_var]+0x39): undefined reference to `secp256k1_fe_equal_var'
clang-15: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [Makefile:59: cryptofuzz] Error 1
ERROR:__main__:Building fuzzers failed.
```

Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=61605.

projects/bitcoin-core/build_cryptofuzz.sh

@@ -95,6 +95,46 @@ export BOTAN_INCLUDE_PATH="$SRC/botan/build/include"
 
 # Build Cryptofuzz
 cd $SRC/cryptofuzz
+( # Temporary workaround for build failure: https://github.com/guidovranken/cryptofuzz/pull/55
+echo 'RnJvbSAwZjQ2MmRlZWNmMDE1MDM4MmU4MTVmNmViN2ZiMDhjYWYzNTcxY2ZjIE1vbiBTZXAgMTcgMDA6MD
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 python gen_repository.py
 rm extra_options.h
 echo -n '"' >>extra_options.h