insane: handle recursive configures when checking for unknown configure options
Some recipes have configure scripts that recursively call other configure
scripts (e.g. dropbear). These multiple-line matches were not being handled
correctly, so iterate over every matching line instead of assuming only one line
was found.
[ YOCTO #5646 ]
Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
