std.c: fix few capcisum api calls, following-up on 6ae19fa.
only variadic calls are prefixed with underscores.
ref: https://github.com/freebsd/freebsd-src/blob/59833b089e78463a561706fc03777249766aea01/sys/sys/capsicum.h#L326
72dd22f262David CARLIER committed on 6/24/2023, 8:05:45 PM· committed by Andrew Kelleyparent7ad1042