[Rpm-maint] [rpm-software-management/rpm] Provide function for $optflags manipulation (#814)

[marxin]

> `%remove_optflags 'undesirable'`
> `%replace_optflags 'oldval' 'newval'`

Then we can have just the simple one. Following works for me:
```
$ rpm --define "%optflags -flto=auto -O2" --define "%replace_optflags() %global optflags %(echo %optflags | sed s/%{?1}/%{?2}/)" --eval '%replace_optflags "-flto=auto"' --eval 'optflags=%optflags'

optflags= -O2
rpm --define "%optflags -flto=auto -O2" --define "%replace_optflags() %global optflags %(echo %optflags | sed s/%{?1}/%{?2}/)" --eval '%replace_optflags "-O2" "-O3"' --eval 'optflags=%optflags'

optflags=-flto=auto -O3
```

Thoughts?

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