A baseline difference between arm64 and x86 showed up. We would
print a wrong character as negative value on x86 due to chars
being signed by default. Force an unsigned interpretation which
is also more reasonable because we'd have never indexed the
base64 table with -112
-XXXXXXXXXX.XXXXXX XXXXXXXXXXX 131.243.99.154 3288 193.159.183.138 80 base64_illegal_encoding character -112 ignored by Base64 decoding F zeek -
+XXXXXXXXXX.XXXXXX XXXXXXXXXXX 131.243.99.154 3288 193.159.183.138 80 base64_illegal_encoding character 144 ignored by Base64 decoding F zeek -
Fixes more of #2742