The source project of this merge request has been removed.
makepkg.conf: set LTOFLAGS="-flto=auto"
For use with pacman 6.0.1-4 which backports support for LTOFLAGS in
order to speed up builds that use gcc as the compiler. This is less
useful when clang is used, though a hack would be to specify in the
PKGBUILD LTOFLAGS="-flto=thin"
(outside of any function).