Rollup merge of #108017 - chbaker0:fix-105967, r=chbaker0

Add `--no-undefined-version` link flag and fix associated breakage

LLVM upstream sets `--no-undefined-version` by default in lld: https://reviews.llvm.org/D135402.

Due to a bug in how version scripts are generated, this breaks the `dylib` output type for most crates. See https://github.com/rust-lang/rust/issues/105967#issuecomment-1428671533 for details.

This PR adds the flag to gcc flavor linkers in anticipation of this LLVM change rolling in, and patches `rustc` to not attempt to export `__rust_*` allocator symbols when they weren't generated.

Fixes #105967

src/allocator.rs

@@ -4,6 +4,7 @@
 use crate::prelude::*;
 
 use rustc_ast::expand::allocator::{AllocatorKind, AllocatorTy, ALLOCATOR_METHODS};
+use rustc_codegen_ssa::base::allocator_kind_for_codegen;
 use rustc_session::config::OomStrategy;
 use rustc_span::symbol::sym;
 
@@ -13,13 +14,7 @@ pub(crate) fn codegen(
     module: &mut impl Module,
     unwind_context: &mut UnwindContext,
 ) -> bool {
-    let any_dynamic_crate = tcx.dependency_formats(()).iter().any(|(_, list)| {
+    let Some(kind) = allocator_kind_for_codegen(tcx) else { return false };
-        use rustc_middle::middle::dependency_format::Linkage;
-        list.iter().any(|&linkage| linkage == Linkage::Dynamic)
-    });
-    if any_dynamic_crate {
-        false
-    } else if let Some(kind) = tcx.allocator_kind(()) {
     codegen_inner(
         module,
         unwind_context,
@@ -28,9 +23,6 @@ pub(crate) fn codegen(
         tcx.sess.opts.unstable_opts.oom,
     );
     true
-    } else {
-        false
-    }
 }
 
 fn codegen_inner(