* perl and python now support vendor-folders for modules and use correct
(i.e. writable) site-folders
* git, mercurial and scons have been adjusted to put their perl/python
modules into respective vendor-modules folders
* only the source package are actually relevant, as the source paths
within older versions of those source packages no longer match the
expectations of the build system
Almost complete. bepdf is still missing, since it doesn't build with gcc
4 and a few source packages are missing as well (binutils and gcc
because haikuporter doesn't build them correctly ATM, mesa due to an
oversight).