bug#54263: 29.0.50; color-values-from-color-spec accepts whitespace in rgbi: specifications

[Mattias Engdegård]

> I haven't seen the function being used anywhere up until now (which doesn't 
> have to mean anything), but considering that this is a relatively niche 
> edge-case I would say that the bug should either be solved now or never. 

Let's solve it now then. I'm to blame, patch attached.

0001-Don-t-accept-leading-whitespace-in-rgbi-colour-specs.patch
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