libfilteraudio crashes uTox if compiled with hardened gcc on gentoo

[ghost]

As per this notsecure/uTox#844 (comment)
But this doesn't really mean it's libfilteraudio's fault, maybe it is still uTox's fault somehow(in the way it's loading the lib?) and it's only caught in libfilteraudio because of the hardened stuff... no idea really.

Thanks.

[zetok]

@emanueLczirai qTox works fine, so it's most likely µTox at fault..

[jpgrego]

Compiling libfilteraudio with vanilla gcc is a temporary workaround. However, qTox seems to also use libfilteraudio, so no idea what's causing the problem with uTox.