install python per epics arch

configure/RULES_PY

@@ -1,9 +1,14 @@
+ifneq ($(T_A),)
 
-PY_FILES = $(PY:%=$(INSTALL_LOCATION)/python/%)
+PY_INSTALL_DIR = $(INSTALL_LOCATION)/python/$(T_A)
 
-$(PY_FILES) : $(INSTALL_LOCATION)/python/%: ../%
+PY_FILES += $(PY:%=$(PY_INSTALL_DIR)/%)
+
+$(PY_FILES) : $(PY_INSTALL_DIR)/%: ../%
 	@[ -d $(dir $@) ] || install -d $(dir $@)
 	@echo "Install PY $@"
 	install -m 644 $< $@
 
 build: $(PY_FILES)
+
+endif