Bug 1574077 - Add credui.dll to delayload DLL. r=dmajor

Bug 1498518 adds credui.dll to use OS's authenticate dialog for WebAuth support, but this isn't required at start up etc. So we should move this to delay load DLL list.

Differential Revision: https://phabricator.services.mozilla.com/D42079

--HG--
extra : moz-landing-system : lando

toolkit/library/moz.build

@@ -24,6 +24,7 @@ def Libxul(name, output_category=None):
 
     DELAYLOAD_DLLS += [
         'comdlg32.dll',
+        'credui.dll',
         'hid.dll',
         'msimg32.dll',
         'netapi32.dll',