Workaround for missing definition of ENOTSUP on Win32
Workaround for missing definition of ENOTSUP on Win32

The ENOTSUP error code is not defined on Win32. However we can simply
use an equivalent from the Windows Socket API (WSA). Fixes Win32 build
with recent versions of libmodbus.

hmoraes/libmodbus,vb2685/modbus,sdwuyawen/libmodbus,hmoraes/libmodbus,cukier/libmodbus,chenzhouneng/libmodbus,charlie-x/libmodbus,marinbek/libmodbus,killdaclick/libmodbus,sstiller/libmodbus,marinbek/libmodbus,dhruvvyas90/libmodbus,charlie-x/libmodbus,sstiller/libmodbus,wablair/libmodbus,OliverDDS/libmodbus,stephane/libmodbus,chenzhouneng/libmodbus,poulacou/libmodbus,dhruvvyas90/libmodbus,cukier/libmodbus,vb2685/modbus,sdwuyawen/libmodbus,hmoraes/libmodbus,cmcmurrough/libmodbus,OliverDDS/libmodbus,wysman/libmodbus,charlie-x/libmodbus,marinbek/libmodbus,itiserik/libmodbus,sstiller/libmodbus,vb2685/modbus,chenzhouneng/libmodbus,SystemTera/libmodbus,dhruvvyas90/libmodbus,killdaclick/libmodbus,wablair/libmodbus,poulacou/libmodbus,xtypebee/libmodbus,cmcmurrough/libmodbus,stephane/libmodbus,OliverDDS/libmodbus,xtypebee/libmodbus,sureforce/new,itiserik/libmodbus,wablair/libmodbus,sureforce/new,mhei/libmodbus,stephane/libmodbus,mhei/libmodbus,sdwuyawen/libmodbus,xtypebee/libmodbus,SystemTera/libmodbus,killdaclick/libmodbus,SystemTera/libmodbus,wysman/libmodbus,poulacou/libmodbus,cmcmurrough/libmodbus,wysman/libmodbus,itiserik/libmodbus,sureforce/new,giangdo/modbusMSim,mhei/libmodbus,cukier/libmodbus