Fix struct redefinition error in headers on Linux

Glibc and Linux kernel both contain duplicate definitions of structures
like struct sockaddr_in leading to:

    /usr/include/netinet/in.h:31:8: error: redefinition of ‘struct in_addr’
    In file included from /usr/include/linux/netfilter.h:7,
                     from /usr/include/linux/netfilter_ipv4.h:9,
                     from ../common/smtppass.c:64:
    /usr/include/linux/in.h:94:8: note: originally defined here

But we do need to include the linux netfilter definitinos here. Changing
the order seems to help

0 files changed, 0 insertions, 0 deletions