guile2: string-delete and string-filter

[Thomas Morley]

Hi Antonio,

I had a look at your patch:
0012-XXX-fix-some-warnings-about-string-delete-and-string.patch

In it's current state this patch will stop guile-1.8 from working, if
the changed procedures are called.
I think we need to differ between the versions, because LilyPond
should keep being compilable with guile-1.8

How about the attached?

Cheers,
  Harm

0001-Fix-some-warnings-about-string-delete-and.patch
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