Make x86_64-unknown-linux-none relocation-model=static by default

Writing our own dynamic loader is fun, but shouldn't be the default
expectation.

Author: Noratrieb

compiler/rustc_target/src/spec/targets/x86_64_unknown_linux_none.rs

@@ -1,4 +1,4 @@
-use crate::spec::{Cc, LinkerFlavor, Lld, PanicStrategy, StackProbeType, Target, base};
+use crate::spec::{Cc, LinkerFlavor, Lld, PanicStrategy, RelocModel, StackProbeType, Target, base};
 
 pub(crate) fn target() -> Target {
     let mut base = base::linux::opts();
@@ -8,6 +8,9 @@ pub(crate) fn target() -> Target {
     base.linker_flavor = LinkerFlavor::Gnu(Cc::No, Lld::Yes);
     base.linker = Some("rust-lld".into());
     base.panic_strategy = PanicStrategy::Abort;
+    // Without any runtime, users would need to write their own dynamic loader to make PIE work.
+    // While they are free to do that, avoid making that the default.
+    base.relocation_model = RelocModel::Static;
 
     Target {
         llvm_target: "x86_64-unknown-linux-none".into(),