A regression introduced in 4c43245e0b is causing the 'xbps-src update-sys'
command to skip the final step of installing the updated packages.
This happens because the `cmd` variable name clashes with a loop
variable used in common/environment/setup/install.sh script (line 16).
Thus the `"$cmd" == installed` comparison
(common/xbps-src/shutils/bulk.sh line 122) fails and the installation
step is skipped.
Using unique variable names in `bulk.sh` avoids this problem.
Closes: #39969 [via git-merge-pr]
7c3f5a15b9