zbar: add a patch to wrap logical not operations into parenthesis

This fixes build failures like this one:

zbar/decoder/ean.c: In function 'ean_part_end4':
zbar/decoder/ean.c:297:13: error: logical not is only applied to the
left hand side of comparison [-Werror=logical-not-parentheses]
     if(!par == fwd) {

This patch has been sent upstream as a pull request:

  https://github.com/ZBar/ZBar/pull/9

Fixes:

  http://autobuild.buildroot.net/results/299/299dc845af082167085d366b38daf1dfd95d7047/



Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>