[Bug-apl] Error building on OSX

[Elias Mårtenson]

A new error when building on OSX:

g++ -DHAVE_CONFIG_H -I. -I../..    -I .. -g -O2 -DAP_NUM=210 -g -MT
AP210-UdpSocket.o -MD -MP -MF .deps/AP210-UdpSocket.Tpo -c -o
AP210-UdpSocket.o `test -f '../UdpSocket.cc' || echo './'`../UdpSocket.cc

*../Svar_DB.cc:94:25: **error: **use of undeclared identifier 'SOL_TCP'*

     setsockopt(DB_tcp, SOL_TCP, TCP_NODELAY, &ndelay, sizeof(int));

*                        ^*

1 error generated.

make[3]: *** [AP100-Svar_DB.o] Error 1

Regards,
Elias