This was added to make sure pkg file metadata contains a different mtime
(in seconds precision), but building multiple pkgs in less than a second
will be really strange.
The build.sh script is now responsible to handle all the logic to build
a source package and its subpackages, as well as all its required
build dependencies. Thanks to this and subshells, dependencies are now
built into its own child process, creating a process tree that can go
nested as long as your system allows forking and has enough memory :-)
This fixes some issues that have been while building pkgs that have lots
of nested dependencies.
