msi: Don't fail if the directory already exists in MsiCreateAndVerifyInstallerDirectory.
[wine] / dlls / typelib.dll16 /
drwxr-xr-x   ..
-rw-r--r-- 146 Makefile.in
-rw-r--r-- 6651 typelib.c
-rw-r--r-- 426 typelib.dll16.spec