unix/Makefile: Update coverage tests to match those in Travis.

ports/unix/Makefile

@@ -258,7 +258,8 @@ coverage_test: coverage
 	cd $(TOP)/tests && MICROPY_MICROPYTHON=../$(DIRNAME)/micropython_coverage ./run-tests
 	cd $(TOP)/tests && MICROPY_MICROPYTHON=../$(DIRNAME)/micropython_coverage ./run-tests -d thread
 	cd $(TOP)/tests && MICROPY_MICROPYTHON=../$(DIRNAME)/micropython_coverage ./run-tests --emit native
-	cd $(TOP)/tests && MICROPY_MICROPYTHON=../$(DIRNAME)/micropython_coverage ./run-tests --via-mpy -d basics float
+	cd $(TOP)/tests && MICROPY_MICROPYTHON=../$(DIRNAME)/micropython_coverage ./run-tests --via-mpy -d basics float micropython
+	cd $(TOP)/tests && MICROPY_MICROPYTHON=../$(DIRNAME)/micropython_coverage ./run-tests --via-mpy --emit native -d basics float micropython
 	cat $(TOP)/tests/basics/0prelim.py | ./micropython_coverage | grep -q 'abc'
 	gcov -o build-coverage/py $(TOP)/py/*.c
 	gcov -o build-coverage/extmod $(TOP)/extmod/*.c