e1000: Rename the SEC symbol to SEQEC

SunOS defines SEC in <sys/time.h> as 1 (commonly used time symbols).

This fixes build on SmartOS (Joyent).

Patch cherry-picked from pkgsrc by jperkin (Joyent).

Signed-off-by: Kamil Rytarowski <n54@gmx.com>
Reviewed-by: Dmitry Fleytman <dmitry@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>