[FS#781] nslookup - cant optionally use a specified DNS server

[LEDE Bugs]

The following task has a new comment added:

FS#781 - nslookup - cant optionally use a specified DNS server
User who did this - FreifunkUFO (FreifunkUFO)

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oh:
https://dev.openwrt.org/ticket/18333

tells:
Since trunk is now build with musl by default, nslookup is basically broken when a server is specified. 
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=781#comment2620