ser2net: Only build for linux
ser2net: Only build for linux

Signed-off-by: Esben Haabendal <da90c138e4a9573086862393cde34fa33d74f6e5@haabendal.dk>

oe-lite/base,sknsean/base,moths/base,sknsean/base,hundeboll/base,kimrhh/base,oe-lite/base,moths/base,esben/base,moths/base,sknsean/base,moths/base,kimrhh/base,moths/base,kimrhh/base,sknsean/base,hundeboll/base,esben/base,oe-lite/base,esben/base,oe-lite/base,esben/base,oe-lite/base,moths/base,hundeboll/base,kimrhh/base,kimrhh/base,esben/base,hundeboll/base,hundeboll/base,oe-lite/base,hundeboll/base,esben/base,sknsean/base,sknsean/base,kimrhh/base