[Rpm-maint] [rpm-software-management/rpm] rpmspec: Support - as input for reading from stdin (PR #1928)

[Florian Festi]

"duplicates standard input" is pretty ambiguous. I expected this to be a dup() of stdin and each byte read from there being gone - as it is with `dup(STDIN_FILENO)` , but strace confirms that I can read the same content send into stdin with `cat file |` multiple times - once per opening `/dev/stdin`. That's not quite what I remember as standard pipe behaviour. But may be it's been too long.

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