[Rpm-maint] [rpm-software-management/rpm] RFE: Convenient version comparison macro (#1217)

[Panu Matilainen]

We can't really hijack integers because we support simple mathematical operations on them besides just comparison, and might be some other technical restrictions. In any case, string comparisons in specs typically are either == or !=, in which case treating them as versions wouldn't affect the outcome. And looking at Fedora specs, there are numerous examples where people actually use just that (apparently oblivious to it not doing what they expect):

```
%if "%{php_version}" < "5.6"
%if "%(pkg-config --version 2>/dev/null)" < "0.20.0"
%if "%{version}" > "2.12"
%if "%{_qt5_version}" < "5.12.0"
%if "%version" < "0.20"
%if 0%{?rhel} && "%rhel" < "5"
```

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