[Bug 15886] awk mishandling first line of input

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=15886

--- Comment #1 from ocbb23b at slowpine.com ---
root at clean2305:~# (echo a; echo b) | awk 'BEGIN {ignore=$1} $2 != 0'
b
root at clean2305:~# (echo a; echo b) | awk 'BEGIN {ignore=$4} $2 != 0'
a
b
root at clean2305:~#


This is another example of the problem.  Note that if we reference $4, then the
initialisation is done right for the first line

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