stdenv: move --enable-deterministic-archives flag into GNU wrapper

`--enable-deterministic-archives` is a GNU specific strip flag and
causes other strip implementations (for example LLVM's, see #138013)
to fail. Since strip failures are ignored, this means that stripping
doesn't work at all in certain situation (causing unnecessary
dependencies etc.).

To fix this, no longer pass `--enable-deterministic-archives`
unconditionally, but instead add it in a GNU binutils specific strip
wrapper only.

`commonStripFlags` was only used for this flag, so we can remove
it altogether.

Future work could be to make a generic strip wrapper, with support for
nix-support/strip-flags-{before,after} and NIX_STRIP_FLAGS_{BEFORE,AFTER}.
This possibly overkill and unnecessary though -- also with the
additional challenge of incorporating the darwin strip wrapper somehow.

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

···
       echo "-arch ${targetPlatform.darwinArch}" >> $out/nix-support/libc-ldflags
     ''
 
+    ##
+    ## GNU specific extra strip flags
+    ##
+
+    # TODO(@sternenseemann): make a generic strip wrapper?
+    + optionalString (bintools.isGNU or false) ''
+      wrap ${targetPrefix}strip ${./gnu-binutils-strip-wrapper.sh} \
+        "${bintools_bin}/bin/${targetPrefix}strip"
+    ''
+
     ###
     ### Remove LC_UUID
     ###

pkgs/build-support/bintools-wrapper/gnu-binutils-strip-wrapper.sh

···
+#! @shell@
+# shellcheck shell=bash
+
+exec @prog@ --enable-deterministic-archives "$@"

pkgs/build-support/setup-hooks/strip.sh

···
 
     if [ -n "${dirs}" ]; then
         header "stripping (with command $cmd and flags $stripFlags) in$dirs"
-        find $dirs -type f -exec $cmd $commonStripFlags $stripFlags '{}' \; 2>/dev/null
+        find $dirs -type f -exec $cmd $stripFlags '{}' \; 2>/dev/null
         stopNest
     fi
 }

pkgs/stdenv/linux/default.nix

···
       targetPlatform = localSystem;
       inherit config;
 
-      preHook = ''
-        # Make "strip" produce deterministic output, by setting
-        # timestamps etc. to a fixed value.
-        commonStripFlags="--enable-deterministic-archives"
-        ${commonPreHook}
-      '';
+      preHook = commonPreHook;
 
       initialPath =
         ((import ../common-path.nix) {pkgs = prevStage;});