Update TGS4 PreCompile.sh (#54794)

* Update TGS4 PreCompile.sh

- Fix bad brackets
- Update rust-g build command
- Remove `--default-host`

* Add i686-unknown-linux-gnu target

tools/tgs4_scripts/PreCompile.sh

@@ -23,12 +23,12 @@ set -e
 # install cargo if needful
 if ! [ -x "$has_cargo" ]; then
 	echo "Installing rust..."
-	curl https://sh.rustup.rs -sSf | sh -s -- -y --default-host i686-unknown-linux-gnu
+	curl https://sh.rustup.rs -sSf | sh -s -- -y
 	. ~/.profile
 fi
 
 # apt packages, libssl needed by rust-g but not included in TGS barebones install
-if ! { [ -x "$has_git" ] && [ -x "$has_grep" ] && [ -f "/usr/lib/i386-linux-gnu/libssl.so" ] }; then
+if ! ( [ -x "$has_git" ] && [ -x "$has_grep" ] && [ -f "/usr/lib/i386-linux-gnu/libssl.so" ] ); then
 	echo "Installing apt dependencies..."
 	if ! [ -x "$has_sudo" ]; then
 		dpkg --add-architecture i386
@@ -47,16 +47,16 @@ fi
 if [ ! -d "rust-g" ]; then
 	echo "Cloning rust-g..."
 	git clone https://github.com/tgstation/rust-g
+	cd rust-g
+	rustup target add i686-unknown-linux-gnu
 else
 	echo "Fetching rust-g..."
 	cd rust-g
 	git fetch
-	cd ..
 fi
 
 echo "Deploying rust-g..."
-cd rust-g
 git checkout "$RUST_G_VERSION"
-~/.cargo/bin/cargo build --release
+~/.cargo/bin/cargo build --release --target=i686-unknown-linux-gnu
 mv target/release/librust_g.so "$1/rust_g"
 cd ..