rc.d/nscd: Avoid using setvar

[temcbun_gmail.com]

Summary

setvar is a non-standard feature of sh(1) and thus is not portable.

[emaste]

I don't think there's any expectation that the rc scripts will be portable, but when there's no material difference (e.g. in performance, clarity, maintainability, etc.) I agree we should indeed prefer the portable way.

[temcbun_gmail.com]

In D55091#1259161, @emaste wrote:

I don't think there's any expectation that the rc scripts will be portable, but when there's no material difference (e.g. in performance, clarity, maintainability, etc.) I agree we should indeed prefer the portable way.

I also think so. Besides, the rest of the rc scripts are using this construction instead of setvar. It lingers around only in two places: here and in rc.subr (https://reviews.freebsd.org/D55086).

[temcbun_gmail.com]

Ping.