Actually set IMAGE_SCN_LNK_REMOVE for .rmeta

The code intended to set the IMAGE_SCN_LNK_REMOVE flag for the
.rmeta section, however the value of this flag was set to zero.
Instead use the actual value provided by the object crate.

This dates back to the original introduction of this code in
PR rust-lang#84449, so we were never setting this flag. As I'm not on
Windows, I'm not sure whether that means we were embedding .rmeta
into executables, or whether the section ended up getting stripped
for some other reason.

compiler/rustc_codegen_ssa/src/back/metadata.rs

@@ -6,8 +6,8 @@ use std::path::Path;
 
 use object::write::{self, StandardSegment, Symbol, SymbolSection};
 use object::{
-    elf, Architecture, BinaryFormat, Endianness, FileFlags, Object, ObjectSection, SectionFlags,
-    SectionKind, SymbolFlags, SymbolKind, SymbolScope,
+    elf, pe, Architecture, BinaryFormat, Endianness, FileFlags, Object, ObjectSection,
+    SectionFlags, SectionKind, SymbolFlags, SymbolKind, SymbolScope,
 };
 
 use snap::write::FrameEncoder;
@@ -216,13 +216,12 @@ pub fn create_rmeta_file(sess: &Session, metadata: &[u8]) -> Vec<u8> {
     );
     match file.format() {
         BinaryFormat::Coff => {
-            const IMAGE_SCN_LNK_REMOVE: u32 = 0;
             file.section_mut(section).flags =
-                SectionFlags::Coff { characteristics: IMAGE_SCN_LNK_REMOVE };
+                SectionFlags::Coff { characteristics: pe::IMAGE_SCN_LNK_REMOVE };
         }
         BinaryFormat::Elf => {
-            const SHF_EXCLUDE: u64 = 0x80000000;
-            file.section_mut(section).flags = SectionFlags::Elf { sh_flags: SHF_EXCLUDE };
+            file.section_mut(section).flags =
+                SectionFlags::Elf { sh_flags: elf::SHF_EXCLUDE as u64 };
         }
         _ => {}
     };