libtraceevent does not use $CFLAGS

Description:

libtraceevent is not built with Arch's CFLAGS as EXTRA_CFLAGS="$CFLAGS" is not passed to make so lacks some hardening such as CET. If that is set the build may then fail due to a race condition unless !lto or !makeflags is used. Swapping to the meson build allows building without having to set any of those options but I have not been successful in building and install the documentation using meson/ninja.

Additional info:

Steps to reproduce:

$ namcap -r elfnoshstk libtraceevent-1\:1.8.2-1-x86_64.pkg.tar.zst