Ingo Weinhold 495b360b6b Add support for explicitly preventing rebuilding packages
Due to depending on dynamically built files, package files will always
be rebuilt when they are needed (e.g. when an image is built). The build
variable HAIKU_DONT_REBUILD_PACKAGES can be defined to prevent
rebuilding existing package files (even ones that are out-of-date).

Main target for this change is buildbot. We want to make sure that the
packages in the repository it builds are exactly identical to the ones
in the images, which may not be the case when the packages are rebuilt
(due to different timestamps of contained files). The respective build
order should be:

1. Build repository.
2. Without cleaning the generated directory, build different image types
   with HAIKU_DONT_REBUILD_PACKAGES defined.
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