Fix the shell32 apitests so that they pass on Windows Server 2003 - Windows 10. Many of these fixes are for Vista+, but the most important fixes are for ShellExecCmdLine and FindExecutable which had issues closing windows after tests and deleting test files. Failing to delete these files breaks the other test (i.e. running ShellExecCmdLine would break FindExecutable and vis-versa.)
Follow-up to #6635. The directory search without this flag didn't work.
JIRA issue: CORE-19493
- Add PRF_FIRSTDIRDEF flag for PathResolveW call.
- Delete needless macro definitions in PathQualifyExW.
- Remove an assertion in IsLFNDriveW.
- Fix shell32_apitest:FindExecutable testcase.
Make shell32:FindExecutable testcase stable and trustworthy.
JIRA issue: ROSTESTS-389
- Reduce dependency with sub-program (instead use copy of
notepad.exe).
- Simplify.
