[FS#784] ar71xx: imagebuilder fails when BIN_DIR or EXTRA_IMAGE_NAME is set

[LEDE Bugs]

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FS#784 - ar71xx: imagebuilder fails when BIN_DIR or EXTRA_IMAGE_NAME is set
User who did this - Ken (marconi)

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I still see the issue.

I'm running Fedora 26 : 4.12.9-300.fc26.x86_64

FYI, attached output of "make image PROFILE=HORNETUBx2 BIN_DIR=/tmp/bld".
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=784#comment3477