Auto merge of #2193 - JohnTitor:fix-rustup-on-windows, r=JohnTitor

Attempt to fix the Rustup issue on Windows

r? `@ghost`

Author: bors

ci/install-rust.sh

@@ -12,9 +12,9 @@ else
 fi
 if [ "$OS" = "windows" ]; then
   : "${TARGET?The TARGET environment variable must be set.}"
+  rustup self update
   rustup set profile minimal
-  # FIXME: Add `--no-self-update` to avoid CI failure.
-  rustup update --force $toolchain-"$TARGET" --no-self-update
+  rustup update --force $toolchain-"$TARGET"
   rustup default $toolchain-"$TARGET"
 else
   rustup set profile minimal