Use +secure-plt for powerpc-unknown-linux-gnu{,spe}

Author: taiki-e

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

@@ -18,6 +18,11 @@ pub(crate) fn target() -> Target {
         pointer_width: 32,
         data_layout: "E-m:e-p:32:32-Fn32-i64:64-n32".into(),
         arch: "powerpc".into(),
-        options: TargetOptions { endian: Endian::Big, mcount: "_mcount".into(), ..base },
+        options: TargetOptions {
+            endian: Endian::Big,
+            features: "+secure-plt".into(),
+            mcount: "_mcount".into(),
+            ..base
+        },
     }
 }

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

@@ -21,6 +21,7 @@ pub(crate) fn target() -> Target {
         options: TargetOptions {
             abi: "spe".into(),
             endian: Endian::Big,
+            features: "+secure-plt".into(),
             mcount: "_mcount".into(),
             ..base
         },