installation/metadata-collect-agent/Makefile: Pass the python includes path to...

installation/metadata-collect-agent/Makefile: Pass the python includes path to the Makefile in a more generic way in buildouts.

installation/metadata-collect-agent/Makefile

-ifeq ($(INCLUDE_PYTHON),)
+ifneq ($(PYTHON_PATH),) # this is for buildouts
+	INCLUDE_PYTHON=-I$(shell $(PYTHON_PATH)/bin/python3 -c "from sysconfig import get_paths; print(get_paths()['include'])")
+endif
+ifeq ($(INCLUDE_PYTHON),) # default behavior to get python includes path
 	INCLUDE_PYTHON = $(shell pkg-config --cflags python3 | cut -f 1 -d " ")
 else
 #	INCLUDE_PYTHON = /test/test