Fix FTBFS on several architectures

Ben Hutchingsrequested to merge
benh/linux:build-fixes into debian/latest
  • [ppc64*] udeb: Fix module list inclusion for scsi-modules (fixes FTBFS)
  • [s390x] net: Enable PPP etc. as modules (fixes FTBFS)
  • kernel-wedge: copy-modules: Tighten parsing of depmod output (fixes FTBFS on arm64)
  • perf: Disable Rust test case (fixes FTBFS on armhf and loong64)

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