rust: Fix bloat issue in recent rust updates

Remove the "src/gcc" directory from the Rust source code to reduce the
filesystem build space.

In Rust 1.83 (and 1.84), a full GCC-14 tree was included, which caused
the tar.xz archive to increase by 128 MB and the unpacked sources to
grow by 1.3 GB. This was an upstream error that has been resolved in
Rust 1.85.

After updating to Rust 1.85 we can revert this removal of "src/gcc"

Signed-off-by: Deepesh Varatharajan <Deepesh.Varatharajan@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(adapted from oe-core commit 26a345adc8e050657bfa0b51ea92a3d89e698d9a)
Signed-off-by: Scott Murray <scott.murray@konsulko.com>

Author: Deepesh Varatharajan

recipes-devtools/rust/rust-source.inc

@@ -13,6 +13,17 @@ SRC_URI[rust.sha256sum] = "7b11d4242dab0921a7d54758ad3fe805153c979c144625fecde11
 
 RUSTSRC = "${WORKDIR}/rustc-${RUST_VERSION}-src"
 
+#After updating to Rust 1.85 we can revert this removal of "src/gcc"
+remove_gcc_directory() {
+    # Ensure the gcc directory exists
+    gcc_dir="${S}/src/gcc"
+    if [ -d "$gcc_dir" ]; then
+        rm -rf "$gcc_dir"
+    fi
+}
+# Add postfunc to the do_unpack task
+do_unpack[postfuncs] += "remove_gcc_directory"
+
 UPSTREAM_CHECK_URI = "https://forge.rust-lang.org/infra/other-installation-methods.html"
 UPSTREAM_CHECK_REGEX = "rustc-(?P<pver>\d+(\.\d+)+)-src"