Poking around the ast to correct linenumbers works well for runtime failures
but not for parsing ones. We can use blank linefeeds to correct the line
numbers instead, with the advantage that we don't need to double compile.
(Bitbake rev: 10256ac3e7be7e691176ecc5d55856d88f1fe940)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>