Revert "Merge pull request #28557 from obsidiansystems/binutils-wrapper"

This reverts commit 0a944b345e, reversing
changes made to 61733ed6cc.

I dislike these massive stdenv changes with unclear motivation,
especially when they involve gratuitous mass renames like NIX_CC ->
NIX_BINUTILS. The previous such rename (NIX_GCC -> NIX_CC) caused
months of pain, so let's not do that again.

pkgs/build-support/cc-wrapper/gnat-wrapper.sh

@@ -13,12 +13,12 @@ if [ -n "@coreutils_bin@" ]; then
     PATH="@coreutils_bin@/bin"
 fi
 
-source @out@/nix-support/utils.sh
-
 if [ -z "${NIX_@infixSalt@_GNAT_WRAPPER_FLAGS_SET:-}" ]; then
     source @out@/nix-support/add-flags.sh
 fi
 
+source @out@/nix-support/utils.sh
+
 
 # Figure out if linker flags should be passed.  GCC prints annoying
 # warnings when they are not needed.