probably broken on aarch64

[boletus-edulis]

Description

TestPacketDataStream::space() fails on aarch64, due to the fact that by default 'char' is unsigned on arm unlike i386 where 'char' is signed.

Using gcc's '-fsigned-char' makes the test work.

FWIW this is enough to run the server. The client does not seem to work, it can not connect to any server, "Invalid Server" appears on the shell.

Steps to reproduce

1. login to your aarch64 machine or vm
2. follow the procedure to build mumble
3. make test

Mumble version

No response

Mumble component

Both

OS

Linux

Reproducible?

Yes

Additional information

No response

Relevant log output

No response

Screenshots

No response

[Krzmbrzl]

Duplicate of #3845