Enable readlink_realpath_* tests on Windows

We modify _basic1.phpt so it runs on Windows as well. The other test
cases hit the issue that `readlink()` fails normally for regular files,

Enable readlink_realpath_* tests on Windows

We modify _basic1.phpt so it runs on Windows as well. The other test
cases hit the issue that `readlink()` fails normally for regular files,
but succeeds on Windows[1]. Therefore, we split these tests, but still
fix the skip reasons.

[1] <http://svn.php.net/viewvc?view=revision&revision=350097>

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