[LibOS] test: Add missing dependencies in Makefiles

LibOS/shim/test/fs/Makefile

@@ -34,8 +34,8 @@ test: $(target)
 	$(RM) fs-test.xml
 	$(MAKE) fs-test.xml
 
-fs-test.xml:
-	python3 -m pytest --junit-xml $@ -v test_fs.py
+fs-test.xml: test_fs.py $(call expand_target_to_token,$(target))
+	python3 -m pytest --junit-xml $@ -v $<
 
 .PHONY: clean-tmp
 clean-tmp:

LibOS/shim/test/regression/Makefile

@@ -48,8 +48,8 @@ regression: $(target)
 	$(RM) libos-regression.xml
 	$(MAKE) libos-regression.xml
 
-libos-regression.xml:
-	python3 -m pytest --junit-xml $@ -v test_libos.py
+libos-regression.xml: test_libos.py $(call expand_target_to_token,$(target))
+	python3 -m pytest --junit-xml $@ -v $<
 
 .PHONY: clean-tmp
 clean-tmp:

Pal/regression/Makefile

@@ -108,7 +108,7 @@ regression:
 	$(MAKE) pal-regression.xml
 
 pal-regression.xml: test_pal.py $(call expand_target_to_token,$(target))
-	python3 -m pytest --junit-xml $@ -v test_pal.py
+	python3 -m pytest --junit-xml $@ -v $<
 
 .PHONY: clean
 clean: