don't compile LRBni prototype for 32-bit arch since LRBni itself is x86_64
don't compile LRBni prototype for 32-bit arch since LRBni itself is x86_64

chr-engwer/Vc,VcDevel/Vc,VcDevel/Vc,chr-engwer/Vc,VcDevel/Vc,chr-engwer/Vc,VcDevel/Vc