Like with stdex::locale_t, this frees us from using Windowsizms on other
platforms. Sockets came from Unix to Windows and not the other way
around in the first place.
Signed-off-by: Simon Rozman <simon@rozman.si>
The stdex::sys_info is instantiated for each compilation unit. To reduce
amount of copies, move it to a separate .hpp as system.hpp is almost
always #included.
Breaking-change: Add #include <stdex/sys_info.hpp>
Signed-off-by: Simon Rozman <simon@rozman.si>