Bug#954322: llvm-9: Should build-depend on libxml2-dev

[Mike Hommey]

Package: llvm-9
Version: 1:9.0.1-9
Severity: wishlist

Dear Maintainer,

Using /usr/lib/llvm-9/bin/llvm-mt with XML manifests fails with:

  llvm-mt: error: no libxml2
 
This happens when LLVM is not built against libxml2.

Simply adding a build dependency on libxml2-dev should make LLVM's build
system pick it and enable the necessary code.

Mike