[Bug 2641] gen_build_files.sh need bash

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=2641

--- Comment #2 from Andrej Gelenberg <andrej.gelenberg at udo.edu>  ---
Created attachment 2551
  --> https://bugs.busybox.net/attachment.cgi?id=2551
build log

Here the make output of vanilla sources.

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