pcl: fix convex hull support
pcl: fix convex hull support

PCL requires a patch to be compatible with QHull 2020.2. The patch has been
accepted upstream, but this commit uses a version of the patch from Conda, which
has been backported to 1.11.

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs