[Rpm-maint] [rpm-software-management/rpm] Use -flto=auto as a default for _lto_cflags. (#809)

[Panu Matilainen]

I can see -flto=auto being useful for the average upstream makefile defaults but I'm not convinced this is the right thing to do in rpm context: we'd want our parallel activities controlled via the same central tunables ($RPM_BUILD_NCPUS / %{_smp_ncpus_max}). If LTO falls back to detecting number of cores on its own, that goal was missed. 

Is there a summary of the gcc community reasoning someplace or can you provide one? 

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