Configure: fix build with -Werror=nonnull.
Configure: fix build with -Werror=nonnull.

Signed-off-by: Piotr Sikora <ba6f3a1a6d7e1ecae91b31e93969cc392fbd0fdd@google.com>

hy0kl/nginx,hy0kl/nginx,hy0kl/nginx