[EXPLORER][SHELL32][SDK] Show/hide 'Run' menu item (#6592)

Improve Start Menu customization.
JIRA issue: CORE-16956
- Add SHSettingsChanged prototype to
  <undocshell.h>.
- Add SetRestriction helper function.
- Implement showing/hiding Run menu
  item of Start Menu.

base/shell/explorer/util.cpp

@@ -163,6 +163,15 @@ BOOL SetAdvancedDword(IN LPCWSTR pszValueName, IN DWORD dwValue)
     return SetRegDword(REGKEY_ADVANCED, pszValueName, dwValue);
 }
 
+BOOL SetRestriction(IN LPCWSTR pszKey, IN LPCWSTR pszValueName, IN DWORD dwValue)
+{
+    WCHAR szSubKey[MAX_PATH] = L"Software\\Microsoft\\Windows\\CurrentVersion\\Policies";
+    PathAppendW(szSubKey, pszKey);
+    SHSetValueW(HKEY_CURRENT_USER, szSubKey, pszValueName, REG_DWORD, &dwValue, sizeof(dwValue));
+    SHSettingsChanged(NULL, NULL);
+    return TRUE;
+}
+
 BOOL
 GetVersionInfoString(IN LPCWSTR szFileName,
                      IN LPCWSTR szVersionInfo,