Fix: Fixed invalid path to local library when detecting project version in Makefile.

(Redmine issue: #3387)

Makefile.inc

@@ -40,7 +40,7 @@ FAINT  = $(shell tput dim)
 # verify/mark the version that is actually being built.
 #
 show-version: FORCE
-	@PYTHONPATH=. $(PYTHON) -c "import $(PROJECT_ID); print($(PROJECT_ID).__version__);"
+	@PYTHONPATH=$(DIR_LIB) $(PYTHON) -c "import $(PROJECT_ID); print($(PROJECT_ID).__version__);"
 
 #
 # Show information about current development environment. This may be very handy
@@ -55,6 +55,6 @@ show-envstamp: FORCE
 	@echo "Grunt version: `grunt --version | tr '\n' ','`"
 	@echo "Psql version: `psql --version`"
 	@echo "Project: $(PROJECT_NAME) ($(PROJECT_ID))"
-	@echo "Project version: `PYTHONPATH=lib $(PYTHON) -c 'import $(PROJECT_ID); print($(PROJECT_ID).__version__);'`"
+	@echo "Project version: `PYTHONPATH=$(DIR_LIB) $(PYTHON) -c 'import $(PROJECT_ID); print($(PROJECT_ID).__version__);'`"
 	@echo "Pip libraries:"
 	@$(PIP) freeze