Upstream sessions

fixes build

bcal: 1.8 -> 1.9

mpv: Fix mpv 0.29.0 on macOS and disable OpenAL

Add missing dependencies for swi-prolog

to fix non-deterministic failure

tldr: add support for darwin

nodejs: 10.6.0 -> 10.7.0

nixos/tomcat: allow non-package paths in services.tomcat.webapps

nixos/tomcat: correct type specification for virtualHosts

llvm is a library so it should just need to know about build & host.
GCC will already have a cross compiler built.

/cc @Ericson2314 @dtzWill

opencollada: include pcre.h (KhronosGroup/OpenCOLLADA#570)

flatpak: Don't hardcode flatpak binary path in launchers

The hardcoded flatpak path breaks all installed applications when flatpak is
updated.

fixes: https://github.com/NixOS/nixpkgs/issues/43581

In the previous version of this derivation, when the command

?- check_installation.

was issued in the swipl prompt, five errors were encountered. This patch fixes
that, so that the installation is correctly checked.

This enables the usage of the command pack_install to install prolog libraries,
which otherwise fails for the lack of libarchive.

The wrong specification was introduced as part of commit 472f16d.

Fixes #44361.

 rPackages: export buildRPackage

Resolves #44370.

Python interpreter updates