Constrain `-Clto` and `-Cembed-bitcode` flag inheritance to be `clang`-only#1379

madsmtm merged 2 commits intorust-lang:mainrust-lang/cc-rs:mainfrom

jieyouxu:dont-inherit-lto-gccjieyouxu/cc-rs:dont-inherit-lto-gccCopy head branch name to clipboard