[Rpm-maint] [rpm-software-management/rpm] build: check rich dependencies for special characters (4.14.x) (#605)

[Panu Matilainen]

While backporting this seems like an obviously good idea on the first sight, it actually is not:
older rpm versions which do not support rich dependencies also do not look into weak dependencies in any situation, so they're just unused and harmless. This patch changes the situation in that all of a sudden those unused weak dependencies come with hard unsatisfied rpmlib() dependencies, causing said packages to become uninstallable for no good reason.

In case you wonder, we found out this the hard way when this got pulled into RHEL  in an internal version and suddenly all the hell broke loose.

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