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

[Demi Marie Obenour]

> For some reason `/dev/stdin` work on Linux but I have trouble understanding why exactly. But we can't rely on some Linux only mechanism. Closing.

`/dev/stdin` works on Linux and OpenBSD, and probably on every other \*nix-like OS.  It is a symlink to a magic file that, when opened, duplicates standard input.

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