The library blocks were an interesting attempt, but the pain was not
worth the gain, and I removed the source boards for them as I was
cleaning up the tree in commit 3891713 ("Retire old board formats").
But the actual library blocks they generated remained in the tree.
Remove those left-overs too.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
0cf01eee57