pktloc: Add missing function prototypes
pktloc: Add missing function prototypes

Older versions of flex (namely the one used on Travis CI) don't properly
emit function prototypes for pktloc_get_column() and
pktloc_set_column(), leading to GCC -Wmissing-prototypes warnings. Fix
them by manually adding these prototypes.

Signed-off-by: Tobias Klauser <9249c549618448e4c699e8032ba6c7f0d7fd4b7f@distanz.ch>

dsahern/libnl,tklauser/libnl,thom311/libnl,HolyShitMan/libnl-1,dsahern/libnl,tklauser/libnl,greearb/libnl-ct,dsahern/libnl,HolyShitMan/libnl-1,dsahern/libnl,tklauser/libnl,tklauser/libnl,greearb/libnl-ct,HolyShitMan/libnl-1,thom311/libnl,greearb/libnl-ct,HolyShitMan/libnl-1,thom311/libnl