rust: Set release profile settings

* codegen-units, lto, opt-level - Set to values to optimize binary
  size[1].

* overflow-checks - Enabled because in release mode, integer overflows
  are defined as two's complement wrap[2]. It is highly unlikely that
  any program is intentionally relying on this behaviour; it would be
  better to panic instead of continue execution in this case.

* debug, debug-assertions, panic, rpath - Set to their default (release)
  values, to override any settings made by packages, e.g. ripgrep sets
  debug = 1[3].

[1]: https://github.com/johnthagen/min-sized-rust
[2]: https://huonw.github.io/blog/2016/04/myths-and-legends-about-integer-overflow-in-rust/
[3]: https://github.com/BurntSushi/ripgrep/blob/13.0.0/Cargo.toml#L79-L80



Signed-off-by: Jeffery To <jeffery.to@gmail.com>
(cherry picked from commit 8bf2725f9be82eec0849cc5efe77bedeb0a693a0)

lang/rust/rust-values.mk

@@ -81,7 +81,14 @@ CARGO_PKG_CONFIG_VARS= \
 	$(RUST_SCCACHE_VARS) \
 	CARGO_BUILD_TARGET=$(RUSTC_TARGET_ARCH) \
 	CARGO_HOME=$(CARGO_HOME) \
-	CARGO_PROFILE_RELEASE_OPT_LEVEL=s \
+	CARGO_PROFILE_RELEASE_CODEGEN_UNITS=1 \
+	CARGO_PROFILE_RELEASE_DEBUG=false \
+	CARGO_PROFILE_RELEASE_DEBUG_ASSERTIONS=false \
+	CARGO_PROFILE_RELEASE_LTO=true \
+	CARGO_PROFILE_RELEASE_OPT_LEVEL=z \
+	CARGO_PROFILE_RELEASE_OVERFLOW_CHECKS=true \
+	CARGO_PROFILE_RELEASE_PANIC=unwind \
+	CARGO_PROFILE_RELEASE_RPATH=false \
 	CARGO_TARGET_$(subst -,_,$(call toupper,$(RUSTC_TARGET_ARCH)))_LINKER=$(TARGET_CC_NOCACHE) \
 	RUSTFLAGS="$(CARGO_RUSTFLAGS)" \
 	TARGET_CC=$(TARGET_CC_NOCACHE) \