Rollup merge of #74416 - NieDzejkob:linker-locale-utf8, r=oli-obk

Use an UTF-8 locale for the linker.

Using a `C` locale breaks unicode filenames on Guix, where the linker is wrapped by a Guile program.

src/librustc_codegen_ssa/back/linker.rs

@@ -28,7 +28,9 @@ use rustc_target::spec::{LinkOutputKind, LinkerFlavor, LldFlavor};
 pub fn disable_localization(linker: &mut Command) {
     // No harm in setting both env vars simultaneously.
     // Unix-style linkers.
-    linker.env("LC_ALL", "C");
+    // We use an UTF-8 locale, as the generic C locale disables support for non-ASCII
+    // bytes in filenames on some platforms.
+    linker.env("LC_ALL", "en_US.UTF-8");
     // MSVC's `link.exe`.
     linker.env("VSLANG", "1033");
 }