Include directive bug fix

[ykulebiakin]

Hello,

I found an issue with the @include directive: it does not always search 
directories mentioned in AWKPATH.

For example, if we have the following directory structure:

<root>

main.awk

@include "dir1/include.awk"

include/

dir1/

include.awk

then the following command will not work: AWKPATH=include gawk -f ./main.awk, 
because AWKPATH is not used then we have a path (with the directory separator) 
in the @include directive.

I apply the patch to the io.c file which will solve the problem.

Yours sincerely,

Yehor

io.c.patch
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