[Bug 1472314] [NEW] Fix subsequent cmake runs when using multi-arch

[Rohan Garg]

Public bug reported:

Running cmake a second time on a project when using multi-arch seems to
be broken without this patch in Ubuntu.

NB: This is a patch to a patch :)

** Affects: cmake (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  Fix subsequent cmake runs when using multi-arch

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