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The goal is to do hybrid builds in a single jam (instead of calling a sub-jam to build parts with the secondary tool chain). This changeset adds support to configure to prepare multiple tool chains. configure: * Merge option --build-cross-tools-gcc4 into --build-cross-tools. The option does now always require a packaging architecture parameter, i.e. x86_gcc2 for the legacy tool chain. * Multiple occurrences of the --build-cross-tools and --cross-tools-prefix options are allowed. The first one specifies the primary tool chain, the subsequent ones the secondary tool chains. * All architecture dependent jam variables are now suffixed with the name of the packaging architecture. The new HAIKU_PACKAGING_ARCHS contains the packaging architectures for the prepared tool chains. The first element is for the primary tool chain. * No longer generate a separate libgccObjects file. Just put the respective variable into BuildConfig as well. build_cross_tools[_gcc4]: * Replace the <haiku output dir> parameter by a <install dir> parameter. This allows to create different cross-tools directories. They are simply suffixed by the packaging architecture. Jamrules: * For the moment map the variables for the primary tool chain to the respective suffix-less variables, so that everything still works as before. The next step is to actually support the secondary tool chains in the jam build system. This will require quite a bit more butchering, though.