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Recent original .bin files showed up with a version[0] of 49152
= 0xC000, which won't pass our current sanity checks. Restrict
version[0] check to lower 14 bits, to make it pass again.

(This might require further investigation in the future, as it's
possible that this particular header field actually isn't related
to version data at all.)

Fixes #51.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>