[TASK] (import_Seitosh): read CONTRIBDIR from automatic variable
Since vendor Makefiles make use of special GNU make features, we can safely rely on GNU make being in operation. GNU make provides the variable MAKEFILE_LIST from which the relative path can be extracted at which Makefile_var was found. This exactly is the path of the contrib directory, such that the user (calling Makefile) needs not set this variable. Currently the calling Makefiles still set a variable CONTRIBDIR which then simply is overwritten in Makefile_var. Such the setting of CONTRIBDIR is unnecessarily doubled.
Showing with 2 additions and 9 deletions