vscclient: Add required headers to fix build on FreeBSD

Signed-off-by: Ed Maste <emaste@freebsd.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

libcacard/vscclient.c

@@ -11,6 +11,8 @@
  */
 
 #ifndef _WIN32
+#include <sys/socket.h>
+#include <netinet/in.h>
 #include <netdb.h>
 #define closesocket(x) close(x)
 #endif