Set lto=thin for Rust static builds elsewhere

rustc's `lto` flag is incompatible with the new `embed-bitcode=no`. The
release notes for Rust 1.45 recommend controlling LTO with Cargo
profiles, and one way to do that is setting `CARGO_PROFILE_<name>_LTO`
in the environment.

macros/cargo

@@ -18,7 +18,7 @@
 %__cargo_env CARGO_TARGET_DIR="${HOME}/.cache" SKIP_README="true"
 %__cargo_cross_pkg_config PKG_CONFIG_PATH="%{_cross_pkgconfigdir}" PKG_CONFIG_ALLOW_CROSS=1
 %__cargo_cross_env %{__cargo_env} %{__cargo_cross_pkg_config} TARGET_CC="%{_cross_triple}-gnu-gcc"
-%__cargo_cross_env_static %{__cargo_env} %{__cargo_cross_pkg_config} TARGET_CC="%{_cross_triple}-musl-gcc"
+%__cargo_cross_env_static %{__cargo_env} %{__cargo_cross_pkg_config} TARGET_CC="%{_cross_triple}-musl-gcc" CARGO_PROFILE_RELEASE_LTO=thin
 
 %cargo_prep (\
 %{__mkdir} -p %{_builddir}/.cargo \

macros/rust

@@ -15,7 +15,7 @@
 %__global_rustflags_shared -Cprefer-dynamic %__global_rustflags
 
 # Enable LTO and static C runtime.
-%__global_rustflags_static -Clto=thin -Ctarget-feature=+crt-static -Clink-arg=-lgcc %__global_rustflags
+%__global_rustflags_static -Ctarget-feature=+crt-static -Clink-arg=-lgcc %__global_rustflags
 
 %__global_rustflags_shared_toml [%{lua:
     for arg in string.gmatch(rpm.expand("%{__global_rustflags_shared}"), "%S+") do