Merge master into stdenv-updates

Conflicts (easy):
	pkgs/development/compilers/llvm/default.nix
	pkgs/development/compilers/openjdk/default.nix
	pkgs/development/libraries/icu/default.nix
	pkgs/development/libraries/libssh/default.nix
	pkgs/development/libraries/libxslt/default.nix
	pkgs/development/tools/parsing/bison/3.x.nix