As Vim noted above, Strawberry should provide the patch command for you. I wouldn't recommend applying any patches unless you obtained them from Strawberry, and then these should be accompanied by instructions they provide which should be very-exactly followed.
Comment on Re^2: strawberry perl Windows and apply patch
I wouldn't recommend applying any patches unless you obtained them from Strawberry
No - the Strawberry Perl project does not provide patches for Object::Import or any other module.
My advice would therefore be to not refrain from applying the patch simply because Strawberry does not provide it.