rustup: update to 1.16.0.

also symlink rustup into $CARGO_HOME/bin/rustup instead of copying
it. Otherwise we can't update it via xbps

fixes #5398

srcpkgs/rustup/INSTALL.msg

@@ -0,0 +1 @@
+Please run rustup-init after initial install to use rustup.

srcpkgs/rustup/files/rustup.sh

@@ -1,2 +0,0 @@
-# Export PATH ourselves so we don't need to run rustup-init
-export PATH="$PATH:$HOME/.cargo/bin"

srcpkgs/rustup/patches/dont-copy-rustup-bin.patch

@@ -0,0 +1,14 @@
+Upstream: No, not upstreamable like this
+Reason: We want the rustup binary in $CARGO_HOME/bin to be of the
+same version as the one we distribute in this rustup package.
+--- src/rustup-cli/self_update.rs.1	2018-12-13 21:56:55.211778812 +0100
++++ src/rustup-cli/self_update.rs	2018-12-13 21:56:42.763779768 +0100
+@@ -671,8 +671,7 @@
+     if rustup_path.exists() {
+         utils::remove_file("rustup-bin", rustup_path)?;
+     }
+-    utils::copy_file(this_exe_path, rustup_path)?;
+-    utils::make_executable(rustup_path)?;
++    utils::symlink_file(this_exe_path, rustup_path)?;
+     install_proxies()
+ }

srcpkgs/rustup/template

@@ -1,6 +1,6 @@
 # Template file for 'rustup'
 pkgname=rustup
-version=1.15.0
+version=1.16.0
 revision=1
 wrksrc="${pkgname}.rs-${version}"
 build_style=cargo
@@ -12,10 +12,10 @@ maintainer="Daniel Lee Ramírez <dleeram@protonmail.com>"
 license="Apache-2.0, MIT"
 homepage="https://www.rustup.rs"
 distfiles="https://github.com/rust-lang-nursery/${pkgname}.rs/archive/${version}.tar.gz"
-checksum=470441d59dbb33f4e3e52e3f7420734dae0066598802c2b3b4f89f5b3a6a9e45
+checksum=8c4ffeda2088dbdd5ea2eac8acef5ddd57dfcfe1f06a503e3da790f93161e1a6
 
 do_install() {
-	vbin target/${RUST_TARGET}/release/rustup-init rustup
+	vbin target/${RUST_TARGET}/release/rustup-init
 
 	if ! [ "$CROSS_BUILD" ]; then
 		# generate shell completions
@@ -29,8 +29,6 @@ do_install() {
 		vinstall rustup.fish 0644 usr/share/fish/completions/
 	fi
 
-	vinstall ${FILESDIR}/rustup.sh 0644 etc/profile.d/
-
 	vdoc README.md
 	vlicense LICENSE-APACHE
 	vlicense LICENSE-MIT