msi: Don't fail if the directory already exists in MsiCreateAndVerifyInstallerDirectory.
[wine] / dlls / api-ms-win-downlevel-advapi32-l1-1-0 /
drwxr-xr-x   ..
-rw-r--r-- 71 Makefile.in
-rw-r--r-- 9661 api-ms-win-downlevel-advapi32-l1-1-0.spec