Remove -ffreestanding from libprofiler_builtins because we do need the standard library

Author: rojamd

src/libprofiler_builtins/build.rs

@@ -41,7 +41,6 @@ fn main() {
         cfg.flag("-fno-builtin");
         cfg.flag("-fvisibility=hidden");
         cfg.flag("-fomit-frame-pointer");
-        cfg.flag("-ffreestanding");
         cfg.define("VISIBILITY_HIDDEN", None);
         if !target.contains("windows") {
             cfg.define("COMPILER_RT_HAS_UNAME", Some("1"));