* common/w32-reg.c (read_w32_registry_string): Map REG_DWORD to a
string.
(read_w32_reg_string): Add arg r_hklm_fallback and change all callers.
(show_configs): Indicate whether the HKLM fallback was used.
* tools/gpgconf.c (show_other_registry_entries): Fix the Outlook Addin
Registry key.  Indicate whether the HKLM fallback was used.