[FS#474] Imagebuilder fails when odhcpd packages are disabled

[LEDE Bugs]

The following task has a new comment added:

FS#474 - Imagebuilder fails when odhcpd packages are disabled
User who did this - Jo-Philipp Wich (jow-)

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Yeah, this is kind of expected as those packages are part of the default package list and menuconfig does not influence those.

Simply use something like `make image PACKAGES="-odhcp6c -odhcpd"`
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=474#comment1629