use %reldir% in more places in module.mk files in scripts directory * scripts/+containers/module.mk, scripts/+matlab/+lang/module.mk, scripts/audio/module.mk, scripts/deprecated/module.mk, scripts/elfun/module.mk, scripts/general/module.mk, scripts/geometry/module.mk, scripts/gui/module.mk, scripts/help/module.mk, scripts/image/module.mk, scripts/io/module.mk, scripts/java/module.mk, scripts/legacy/module.mk, scripts/linear-algebra/module.mk, scripts/miscellaneous/module.mk, scripts/ode/module.mk, scripts/optimization/module.mk, scripts/path/module.mk, scripts/pkg/module.mk, scripts/plot/appearance/module.mk, scripts/plot/draw/module.mk, scripts/plot/util/module.mk, scripts/polynomial/module.mk, scripts/prefs/module.mk, scripts/profiler/module.mk, scripts/set/module.mk, scripts/signal/module.mk, scripts/sparse/module.mk, scripts/specfun/module.mk, scripts/special-matrix/module.mk, scripts/startup/module.mk, scripts/statistics/module.mk, scripts/strings/module.mk, scripts/testfun/module.mk, scripts/time/module.mk, scripts/web/module.mk: Use %reldir% instead of literal directory name where possbile. Ensure that all private directories are included in FCN_FILE_DIRS list.