[arch-dev-public] CFLAGS

[Allan McRae]

We have a couple of bugs open about our CFLAGS.

1) https://bugs.archlinux.org/task/44361 -Remove the no-op
--param=ssp-buffer-size=4 switch from CFLAGS
Since we moved from -fstack-protector to -fstack-protector-strong, this
paramater is unused and can be removed. 

2) https://bugs.archlinux.org/task/44362 - Add -fstack-check
Read more about this here:
https://gcc.gnu.org/onlinedocs/gccint/Stack-Checking.html
This is essentially a no-op for most code, so should have no real
performance hit.  I can not find any benchmarks to demonstrate that though.

This would mean:
CFLAGS="-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong
-fstack-check"

Opinions?

Allan