apphelp: Add SdbGetAppPatchDir stub.

dlls/apphelp/apphelp.c

@@ -111,3 +111,9 @@ void WINAPI SdbCloseDatabase(PDB pdb)
 {
     FIXME("stub: %p\n", pdb);
 }
+
+void WINAPI SdbGetAppPatchDir(HSDB hsdb, WCHAR *path, DWORD size)
+{
+    FIXME("stub: %p %p %d\n", hsdb, path, size);
+    if (size && path) *path = 0;
+}

dlls/apphelp/apphelp.spec

@@ -49,7 +49,7 @@
 @ stub SdbFreeFileInfo
 @ stub SdbFreeFlagInfo
 @ stub SdbGetAppCompatDataSize
-@ stub SdbGetAppPatchDir
+@ stdcall SdbGetAppPatchDir(long ptr long)
 @ stub SdbGetBinaryTagData
 @ stub SdbGetDatabaseID
 @ stub SdbGetDatabaseInformation