don't run the test on macOS

Author: japaric

src/test/run-make-fulldeps/emit-stack-sizes/Makefile

@@ -1,7 +1,13 @@
 -include ../tools.mk
 
+# This feature only works when the output object format is ELF so we ignore
+# macOS and Windows
 ifdef IS_WINDOWS
-# Do nothing on MSVC.
+# Do nothing on Windows.
+all:
+	exit 0
+else ifneq (,$(filter $(TARGET),i686-apple-darwin x86_64-apple-darwin))
+# Do nothing on macOS.
 all:
 	exit 0
 else