package/cdrkit: fix build with GCC 10

This patch adds a missing extern on the outfile
variable in genisoimage.h.

Signed-off-by: Urja Rannikko <urjaman@gmail.com>
Tested-by: Heiko Thiery <heiko.thiery@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 7d50d04729361ab93423a68d0c930b695bf98c00)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
1 file changed