[SCM] xwax/master: Add bindnow hardening, disable pie for performance reasons

[Daniel James]

Hi Bálint,

> Do you have some good tests/results for measuring the performance differences?

This is tricky, it would require benchmarking the app with various
potential configurations. That's why I'm wondering about enabling an
option which might have an impact I don't know about.

> I'm interested because I'm working on enabling those archive-wide.

I'd suggest that real-time audio applications are a special category,
because a performance degradation might make the program unusable.

Cheers!

Daniel