bintools-wrapper: symlink unsymlinked binaries from -unwrapped

this shouldn't change any binary available in the default build environment
because bintools-unwrapped is already in path ( idk where it comes from but i know because objcopy is in path but not in the wrapper )

this just makes all the binaries available under 'bintools' instead of
having to use 'bintools-unwrapped'

reduces confusion because now 'objcopy' and others will be in 'bintools'

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

@@ -164,11 +164,13 @@ stdenv.mkDerivation {
       wrap ld-solaris ${./ld-solaris-wrapper.sh}
     '')
 
-    # Create a symlink to as (the assembler).
+    # Create symlinks for rest of the binaries.
     + ''
-      if [ -e $ldPath/${targetPrefix}as ]; then
-        ln -s $ldPath/${targetPrefix}as $out/bin/${targetPrefix}as
-      fi
+      for binary in objdump objcopy size strings as nm gprof dwp c++filt addr2line ranlib readelf elfedit; do
+        if [ -e $ldPath/${targetPrefix}''${binary} ]; then
+          ln -s $ldPath/${targetPrefix}''${binary} $out/bin/${targetPrefix}''${binary}
+        fi
+      done
 
     '' + (if !useMacosReexportHack then ''
       wrap ${targetPrefix}ld ${./ld-wrapper.sh} ''${ld:-$ldPath/${targetPrefix}ld}