unpack bootstrap tools arm: fix more rpaths

libstdc++ and libmudflapth link to the dynamic loader; if the
bootstrap uses another dynamic loader name, and the rpath of these
libs isn't changed, they will fail to load.

pkgs/stdenv/linux/scripts/unpack-bootstrap-tools-arm.sh

@@ -23,7 +23,8 @@ for i in $out/bin/* $out/libexec/gcc/*/*/* $out/lib/librt*; do
     LD_LIBRARY_PATH=$out/lib $out/lib/ld-linux*.so.? \
         $out/bin/patchelf --set-interpreter $out/lib/ld-linux*.so.? --set-rpath $out/lib --force-rpath $i
 done
-for i in $out/lib/librt* $out/lib/libcloog* $out/lib/libppl* $out/lib/libgmp*; do
+for i in $out/lib/librt* $out/lib/libcloog* $out/lib/libppl* $out/lib/libgmp* \
+      $out/lib/libstdc++* $out/lib/libmudflap*; do
     echo patching $i
     if ! test -f $i; then continue; fi
     if test -L $i; then continue; fi