rustc_target: Avoid unwraps when adding linker flags

compiler/rustc_target/src/spec/android_base.rs

@@ -6,8 +6,8 @@ pub fn opts() -> TargetOptions {
     // Many of the symbols defined in compiler-rt are also defined in libgcc.
     // Android's linker doesn't like that by default.
     base.pre_link_args
-        .get_mut(&LinkerFlavor::Gcc)
-        .unwrap()
+        .entry(LinkerFlavor::Gcc)
+        .or_default()
         .push("-Wl,--allow-multiple-definition".to_string());
     base.dwarf_version = Some(2);
     base.position_independent_executables = true;