[Rpm-maint] [rpm-software-management/rpm] Flush 20+ year old statfs() jungle, always use standard statvfs() (#1143)

[lgtm-com[bot]]

This pull request **fixes 1 alert** when merging f2122a151c93c4df0d9c1ac902e2ae88ea3c942e into dd08abdd123947fad6bca2044493e7f68375ffc0 - [view on LGTM.com](https://lgtm.com/projects/g/rpm-software-management/rpm/rev/pr-ec7bc6a97065731db06d29091cf2a54d080f4ed4)

**fixed alerts:**

* 1 for FIXME comment

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