openafs, digitalbitbox: amend hacks of removing $(pwd)

Just like commit 3af97fc9ee54f7e5

pkgs/applications/misc/digitalbitbox/default.nix

···
     cp src/hidapi/libusb/.libs/*.so* $out/lib
     cp src/univalue/.libs/*.so* $out/lib
 
-    # [RPATH][patchelf] Avoid forbidden reference error
-    rm -rf $PWD
-
     # Provide udev rules as documented in https://digitalbitbox.com/start_linux
     mkdir -p "$out/etc/udev/rules.d"
     ${copyUdevRuleToOutput "51-hid-digitalbox.rules" udevRule51}
     ${copyUdevRuleToOutput "52-hid-digitalbox.rules" udevRule52}
+  '';
+
+  # remove forbidden references to $TMPDIR
+  preFixup = ''
+    for f in "$out"/{bin,lib}/*; do
+      if [ -f "$f" ] && isELF "$f"; then
+        patchelf --shrink-rpath --allowed-rpath-prefixes "$NIX_STORE" "$f"
+      fi
+    done
   '';
 
   enableParallelBuilding = true;

pkgs/servers/openafs/1.8/default.nix

···
     cp -r doc/doxygen/output/html $devdoc/share/devhelp/openafs/doxygen
   '';
 
-  # Avoid references to $TMPDIR by removing it and let patchelf cleanup the
-  # binaries.
+  # remove forbidden references to $TMPDIR
   preFixup = ''
-    rm -rf "$(pwd)" && mkdir "$(pwd)"
+    for f in "$out"/bin/*; do
+      if isELF "$f"; then
+        patchelf --shrink-rpath --allowed-rpath-prefixes "$NIX_STORE" "$f"
+      fi
+    done
   '';
 
   meta = with lib; {