[vdr] DeleteResume patch for vdr 1.3.32.

[Carsten Koch]

The attached patch lets VDR remove a resume.vdr instead of
storing a position in it that points to the beginning.

In big collections of recordings, this reduces the time
to create/update the recordings menu quite a bit, since
VDR does not have to open hundreds of files just to find
out that the information in them is a non-information.

After this patch has made it into standard VDR, the
performance of the recordings menu can be further enhanced
by *never* reading the file, not even when it does exist,
since with the attached patch it is clear that an existing
resume.vdr always means the recording is not rewound.
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