cc-wrapper, bintools-wrapper: Remove now unneeded set {+,-}u

pkgs/build-support/cc-wrapper/default.nix

@@ -134,8 +134,6 @@ stdenv.mkDerivation {
 
   installPhase =
     ''
-      set -u
-
       mkdir -p $out/bin $out/nix-support
 
       wrap() {
@@ -224,8 +222,6 @@ stdenv.mkDerivation {
 
   postFixup =
     ''
-      set -u
-
       # Backwards compatability for packages expecting this file, e.g. with
       # `$NIX_CC/nix-support/dynamic-linker`.
       #

pkgs/build-support/cc-wrapper/setup-hook.sh

@@ -54,8 +54,6 @@
 # For more details, read the individual files where the mechanisms used to
 # accomplish this will be individually documented.
 
-set -u
-
 # Skip setup hook if we're neither a build-time dep, nor, temporarily, doing a
 # native compile.
 #
@@ -120,4 +118,3 @@ export NIX_HARDENING_ENABLE
 
 # No local scope in sourced file
 unset -v role_pre role_post
-set +u