[python] Use INFER_BIN in python test

Summary: ^^

Reviewed By: dulmarod

Differential Revision:
D64598537

Privacy Context Container: L1208441

fbshipit-source-id: 2240acc070acaf606fbe09495dc04ef93ce39e08

Author: skcho

infer/tests/codetoanalyze/python/exec/Makefile

@@ -24,7 +24,7 @@ eval_with_python.output: main_test.py show_print_output
 	python3 main_test.py > eval_with_python.output
 
 eval_with_infer.output: $(INFER_BIN) main_test.py show_print_output
-	infer --run-python-interpreter -- python3 main_test.py > eval_with_infer.output
+	$(INFER_BIN) --run-python-interpreter -- python3 main_test.py > eval_with_infer.output
 
 .PHONY: test
 test: eval_with_python.output eval_with_infer.output