internal: Refuse values exceeding range of 'unsigned int' in virCheckFlags

internal: Refuse values exceeding range of 'unsigned int' in virCheckFlags

Historically our migration APIs declare 'unsigned long flags'. Since
it's baked into our API we can't change that but we can avoid
compatibility problems by preemptively refusing the extra range on
certain arches to prevent future surprise.

Modify the macro to verify that value passed inside 'flags' doesn't
exceed the range of 'unsigned int'.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>