Originally came up while discussing #217:
Especially now that rpm is expanding macro arguments, it needs a way to quote
the arguments to handle whitespace, empty arguments etc.
This matches what shell does when undefined arguments are passed to functions:
```
rpm --define "%foo() 1:%1 2:%2" --eval "%foo %nil bar"
1:bar 2:%2
```
In some cases that's exactly what's wanted, in some cases it absolutely is not
- what the shell has and we don't is a way to quote the arguments to preserve
empty ones etc. We need that too, and I think this is a blocker for 4.14
release.
Teaching argvSplitString() to handle quotes (optimally when a flag is enabled
to preserve compatibility) would serve various other places too. And if there's
a way to quote, there needs to be a way to escape those quotes to pass literal
quotes.
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