only create source tarball for the Dist subcommand
mark install rule as default for Kind::Install
split install-docs
split install-std
factor out empty_dir handling
split install-cargo
split install-analysis
split install-src
rework install-rustc
properly handle cross-compilation setups for install
use pkgname in install
split plain source tarball generation from rust-src dist
document src-tarball in config.toml.exmaple

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>

closes rust-lang#39974

r? @Mark-Simulacrum

This should include a fix for rust-lang/cargo#4091 with an updated version of
libgit2.

Closes rust-lang/cargo#4091

rustbuild: don't create a source tarball when installing

This splits Install out of Dist as it is not a full dist anymore, and creates the source tarball only for the Dist command.
This will allow splitting install in a few rules if we want as it's done for other phases.

…eddyb

Remove all instances of fragment_infos and fragment sets

Remove unused fragment structs. This was suggested by @eddyb in IRC: [botbot link](https://botbot.me/mozilla/rustc/2017-05-23/?msg=86016574&page=2).

…ulacrum

regression test for rust-lang#39974

closes rust-lang#39974

r? @Mark-Simulacrum

…tsakis

Updated locked version of libgit2

This should include a fix for rust-lang/cargo#4091 with an updated version of
libgit2.

Closes rust-lang/cargo#4091

Allow variadic functions with cdecl calling convention.

Fixes rust-lang#40244.

…ed-tail, r=eddyb

extend `struct_tail` to operate over closures

Not 100% sure why this got exposed when it wasn't before, but this struct definitely seems wrong.

Fixes rust-lang#42110

r? @eddyb