toolchain/binutils: completely remove 2.28 support
authorHans Dedecker <dedeckeh@gmail.com>
Thu, 26 Apr 2018 08:33:31 +0000 (10:33 +0200)
committerHans Dedecker <dedeckeh@gmail.com>
Thu, 26 Apr 2018 08:42:09 +0000 (10:42 +0200)
Commit 15e963915963cda515311531b182b9e0c52f35a0 removed support for
binutils version 2.28 but did not remove it as selectable item
from Binutils Version; let's remove this leftover as well.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

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