manifest: Download only the packages that will use the host OS

The main idea of this is that if Linux is used to build, the
MacOS packages are not required, this would help faster download the code
and would save space on your hard drive.

Change-Id: I10584f56c206d24ae2983c0b1ece661590d16874
Revert "manifest: Download only the packages that will use the host OS"

Will break the nightly. 

This reverts commit 90f504a9006f74bdeff55471437772f95aa54d64.

Change-Id: I40c9037a2e6c63686aa358e8ba9b9b8aa3e8e31e
Merge branch 'pac-4.4' of git://github.com/PAC-man/pacman into pac-4.4