[scudo/standalone] Don't define test main function for Fuchsia

[mcgrathr]

Summary

Fuchsia's unit test library provides the main function by default.

[cryptoad]

compiler-rt/lib/scudo/standalone/tests/scudo_unit_test_main.cpp

33

If you won't use main on Fuchsia do you need the #if?

[mcgrathr]

simplified

[mcgrathr]

update msg

[mcgrathr]

compiler-rt/lib/scudo/standalone/tests/scudo_unit_test_main.cpp

33

I was still using it for one case but not for another. But you made me realize that the zxtest library provides a main function too, so it's actually sufficient to just always omit main for Fuchsia. That simplifies this change a lot.

compiler-rt/lib/scudo/standalone/tests/scudo_unit_test_main.cpp

 __scudo_default_options() {
   if (!UseQuarantine)
     return "dealloc_type_mismatch=" DEALLOC_TYPE_MISMATCH;
   return "quarantine_size_kb=256:thread_local_quarantine_size_kb=128:"
          "quarantine_max_chunk_size=512:"
          "dealloc_type_mismatch=" DEALLOC_TYPE_MISMATCH;
 }
 
-int main(int argc, char **argv) {
+// The zxtest library provides a default main function that does the same thing
+// for Fuchsia builds.
 #if !SCUDO_FUCHSIA
+int main(int argc, char **argv) {
   testing::InitGoogleTest(&argc, argv);
   return RUN_ALL_TESTS();
-#else
-  return RUN_ALL_TESTS(argc, argv);
-#endif
 }
+#endif