Fix various lintian errors and warnings

• lintian: Override some false positives:
  • linux-headers: Override another error and warning for vmlinux
  • [riscv64] linux-image-dbg: Override shared-library-lacks-stack-section for vdso.so
  • [arm64] linux-perf: Override statically-linked-binary for asm_pure_loop
• [ppc64*] linux-image: Fix version in NEWS entry
• linux-source: Suggest pkgconf, not the obsolete pkg-config
• linux-image-dbg: lintian: Drop mismatched override for wrong-section-according-to-package-name
• [amd64]] linux-image-cloud-amd64-dbg: lintian: Drop overrides for vdsox32.so
• d/copyright: Replace old FSF addresses with current GNU license URL
• d/rules.real: Exclude vDSOs from processing by dh_makeshlibs
• linux-doc: Use dh_sphinxdoc to replace embedded Javascript

This partly overlaps with !1461.