[sanitizer] Skip test on Android where chmod is not working

Third attempt to fix a bot failure from
634da7a1 on an Android bot:
https://lab.llvm.org/buildbot#builders/77/builds/14339

My last attempt used an approach from another test where chmod was not
working of using a bad character in the path name. But it looks like
this trick only works on Windows.

Instead, restore the original version of this test before my change at
634da7a1 and move the bad path test to
a new test file, marking it unsupported on Android.