Revert "Merge pull request #28029 from cstrahan/hardening-fix"

This reverts commit 0dbc006760, reversing
changes made to cb7f774265.

Should go into staging.

pkgs/build-support/bintools-wrapper/add-flags.sh

@@ -5,7 +5,6 @@ var_templates_list=(
     NIX+LDFLAGS_BEFORE
     NIX+LDFLAGS_AFTER
     NIX+LDFLAGS_HARDEN
-    NIX+HARDENING_ENABLE
 )
 var_templates_bool=(
     NIX+SET_BUILD_ID
@@ -24,10 +23,10 @@ if [ "${NIX_BINTOOLS_WRAPPER_@infixSalt@_TARGET_TARGET:-}" ]; then
 fi
 
 for var in "${var_templates_list[@]}"; do
-    mangleVarList "$var" ${role_infixes[@]+"${role_infixes[@]}"}
+    mangleVarList "$var" "${role_infixes[@]}"
 done
 for var in "${var_templates_bool[@]}"; do
-    mangleVarBool "$var" ${role_infixes[@]+"${role_infixes[@]}"}
+    mangleVarBool "$var" "${role_infixes[@]}"
 done
 
 if [ -e @out@/nix-support/libc-ldflags ]; then