apr: fix cross compile
apr: fix cross compile

Added more answers to configure tests. Verified that the answers are the
same as the x86_64-linux and aarch64-linux native builds.

Added a patch to work around the /dev/zero mmap detection logic that
doesn't work in the cross case.

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