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Let's add i386 and i486 for embedded, bootloader or other early kernel code.

 - Signed-off-by: René Rebe <rene@exactcode.de>

--- rustc-1.73.0-src/compiler/rustc_target/src/spec/mod.rs.vanilla	2023-10-07 16:10:45.606034645 +0200
+++ rustc-1.73.0-src/compiler/rustc_target/src/spec/mod.rs	2023-10-07 16:11:18.595034753 +0200
@@ -1270,8 +1270,10 @@
 supported_targets! {
     ("x86_64-unknown-linux-gnu", x86_64_unknown_linux_gnu),
     ("x86_64-unknown-linux-gnux32", x86_64_unknown_linux_gnux32),
-    ("i686-unknown-linux-gnu", i686_unknown_linux_gnu),
+    ("i386-unknown-linux-gnu", i386_unknown_linux_gnu),
+    ("i486-unknown-linux-gnu", i486_unknown_linux_gnu),
     ("i586-unknown-linux-gnu", i586_unknown_linux_gnu),
+    ("i686-unknown-linux-gnu", i686_unknown_linux_gnu),
     ("loongarch64-unknown-linux-gnu", loongarch64_unknown_linux_gnu),
     ("m68k-unknown-linux-gnu", m68k_unknown_linux_gnu),
     ("csky-unknown-linux-gnuabiv2", csky_unknown_linux_gnuabiv2),
--- rustc-1.73.0-src/src/tools/build-manifest/src/main.rs.vanilla	2023-10-07 16:09:54.671034477 +0200
+++ rustc-1.73.0-src/src/tools/build-manifest/src/main.rs	2023-10-07 16:10:21.075034564 +0200
@@ -88,6 +88,8 @@
     "bpfel-unknown-none",
     "i386-apple-ios",
     "i586-pc-windows-msvc",
+    "i386-unknown-linux-gnu",
+    "i486-unknown-linux-gnu",
     "i586-unknown-linux-gnu",
     "i586-unknown-linux-musl",
     "i686-apple-darwin",
--- /dev/null
+++ a/compiler/rustc_target/src/spec/targets/i386_unknown_linux_gnu.rs
@@ -0,0 +1,8 @@
+use crate::spec::Target;
+
+pub(crate) fn target() -> Target {
+    let mut base = super::i686_unknown_linux_gnu::target();
+    base.cpu = "i386".into();
+    base.llvm_target = "i386-unknown-linux-gnu".into();
+    base
+}
--- /dev/null
+++ a/compiler/rustc_target/src/spec/targets/i486_unknown_linux_gnu.rs
@@ -0,0 +1,8 @@
+use crate::spec::Target;
+
+pub(crate) fn target() -> Target {
+    let mut base = super::i686_unknown_linux_gnu::target();
+    base.cpu = "i486".into();
+    base.llvm_target = "i486-unknown-linux-gnu".into();
+    base
+}