feature request: making invalid feature request error more friendly

[Noel Grandin]

Hi

See the mailing list thread here:
http://lists.freedesktop.org/archives/libreoffice/2014-May/061498.html
for more context.

I just spent quite a while tracking down the fact that I had a trailing space 
on a line in my autogen.input file.

It would be really handy if we could we modify the following error message:

   configure: error: invalid feature name: debug

so it reads something like

  configure: error: invalid feature name: 'debug '

So that I had a better chance of spotting the error.

Thanks a lot,
   Noel Grandin

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