[FS#837] PROVIDES handling for non-virtual packages

[LEDE Bugs]

The following task has a new comment added:

FS#837 - PROVIDES handling for non-virtual packages
User who did this - Matthias Schiffer (NeoRaider)

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I've tried my luck (and practically non-existing Perl knowledge) in fixing this, and pushed something to my staging that seems to work: https://git.lede-project.org/?p=lede/neoraider/staging.git;a=shortlog;h=refs/heads/provides
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=837#comment2912