manifest: update default lto for release and bench to 'thin'.
manifest: update default lto for release and bench to 'thin'.

rustyhorde/cargo,rustyhorde/cargo,rustyhorde/cargo,rust-lang/cargo,rust-lang/cargo,nipunn1313/cargo,tsurai/cargo,tshepang/cargo,tshepang/cargo,vojtechkral/cargo,rust-lang/cargo,tsurai/cargo,rust-lang/cargo,eminence/cargo,tsurai/cargo,vojtechkral/cargo,eminence/cargo,tshepang/cargo,nipunn1313/cargo,vojtechkral/cargo,tsurai/cargo,nipunn1313/cargo,nipunn1313/cargo,vojtechkral/cargo,eminence/cargo,tsurai/cargo,tshepang/cargo,eminence/cargo,rustyhorde/cargo