msiexec: add a fixme for administrative installs

[Austin English]

Otherwise the user has no idea what failed, e.g.,
http://bugs.winehq.org/show_bug.cgi?id=26813

-- 
-Austin
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diff --git a/programs/msiexec/msiexec.c b/programs/msiexec/msiexec.c
index 0944955..1b688a5 100644
--- a/programs/msiexec/msiexec.c
+++ b/programs/msiexec/msiexec.c
@@ -630,6 +630,7 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 			WINE_TRACE("argvW[%d] = %s\n", i, wine_dbgstr_w(argvW[i]));
 			PackageName = argvW[i];
 			StringListAppend(&property_list, ActionAdmin);
+			WINE_FIXME("Administrative installs are not currently supported\n");
 		}
 		else if(msi_option_prefix(argvW[i], "f"))
 		{