package/quagga: fix build with gcc 10

Fixes:
 - http://autobuild.buildroot.org/results/fd5ee2b52a3cfaec268fafd3ffe4c30e51465c7e

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
1 file changed