[FS#977] building iw is currently failing on version.sh

[LEDE Bugs]

The following task has a new comment added:

FS#977 - building iw is currently failing on version.sh
User who did this - Jo-Philipp Wich (jow-)

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The iw Makefile is supposed to remove version.sh and replace it with an empty file.

Please provide the complete output of "make package/iw/{clean,compile} V=sc"
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=977#comment3297