[Rpm-maint] [rpm-software-management/rpm] \x1a (ASCII unit separator) cannot be escaped (#1438)

[Demi Marie Obenour]

Right now, I cannot write a Lua function `quote_array` that converts an array of strings to a string that (when used as the argument to a macro) will be interpreted as the initial array.  This is because \\x1a (ASCII unit separator) cannot be escaped.

One solution would be to allow \\x1a to be escaped by doubling it, and have `%{quote:…}` do this automatically.

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