Convert CRLF for script bin files

After we started generating our own bin links, we did not provide the
line-ending normalization that npm did. This corrects that to have
similar behavior to before for packages with CRLF line-endings.

This also has a drive-by change to remove the unnecessary
`patchShebangs` due to the `patchShebangsAuto` hook running and finding
these files just fine now.

nix/node-env.nix

@@ -530,12 +530,15 @@ let
         then
             ln -s $out/lib/node_modules/.bin $out/bin
 
-            # Patch the shebang lines of all the executables
+            # Fixup all executables
             ls $out/bin/* | while read i
             do
                 file="$(readlink -f "$i")"
                 chmod u+rwx "$file"
-                patchShebangs "$file"
+                if isScript "$file"
+                then
+                    sed -i 's/\r$//' "$file"  # convert crlf to lf
+                fi
             done
         fi