Add options to be able to prepend or append targets
When listing an other project in
input_files, it is possible to specify other targets which will be used to build this project.
tor-browser-build we do this for example in
projects/https-everywhere/config to use the
common-stretch target and avoid building a different python for each platform.
The issue however with setting
target is that it is replacing any previous target. In many cases however it would be useful to keep the previous targets and only append or prepend some other targets.