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

[marxin]

After a long discussion, we as GCC community newly introduced
-flto=auto option. Doing that, LTO can automatically detect
make's jobserver or fall back to # of cores.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/809

-- Commit Summary --

  * Use -flto=auto as a default for _lto_cflags.

-- File Changes --

    M platform.in (6)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/809.patch
https://github.com/rpm-software-management/rpm/pull/809.diff

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https://github.com/rpm-software-management/rpm/pull/809
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