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).

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• 74164e34 - makepkg.conf: set LTOFLAGS="-flto=auto"

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