net-p2p/monero-cli: mark as broken on aarch64

Fails to compile with the following errors:

/wrkdirs/usr/ports/net-p2p/monero-cli/work/monero-0.17.3.0/src/crypto/slow-hash.c:1118:22: warning: implicit declaration of function 'getauxval' is invalid in C99 [-Wimplicit-function-declaration]

supported = (getauxval(AT_HWCAP) & HWCAP_AES) != 0;
             ^

/wrkdirs/usr/ports/net-p2p/monero-cli/work/monero-0.17.3.0/src/crypto/slow-hash.c:1118:32: error: use of undeclared identifier 'AT_HWCAP'

supported = (getauxval(AT_HWCAP) & HWCAP_AES) != 0;
                       ^

/wrkdirs/usr/ports/net-p2p/monero-cli/work/monero-0.17.3.0/src/crypto/slow-hash.c:1118:44: error: use of undeclared identifier 'HWCAP_AES'

supported = (getauxval(AT_HWCAP) & HWCAP_AES) != 0;
                                   ^