r.learn.ml2 fix import of rlearnlib (#367)

* fix Makefile
* make 'rlearnlib' dir in the installation dir

Co-authored-by: Tomas Zigo <tomas.zigo@slovanet.sk>

grass7/raster/r.learn.ml2/rlearnlib/Makefile

@@ -13,10 +13,11 @@ PYCFILES := $(patsubst %,$(ETCDIR)/%.pyc,$(MODULES))
 default: $(PYFILES) $(PYCFILES)
 
 $(ETCDIR):
-	$(MKDIR) -p $@
+	$(MKDIR) $@
 
 $(ETCDIR)/%: % | $(ETCDIR)
 	$(INSTALL_DATA) $< $@
 
 install:
+	$(MKDIR) $(INST_DIR)/etc/r.learn.ml2/rlearnlib
 	cp -r $(ETCDIR) $(INST_DIR)/etc/r.learn.ml2