Fix emulator core and UI on Windows

There are two parts in this CL:
1. Fixing the Windows build (missing set_fd_handler)
2. Replacing read/write with socket_recv/socket_send.

Change-Id: I5fa599774260257d481b738a892e1124135fc319
diff --git a/android/protocol/ui-commands-impl.c b/android/protocol/ui-commands-impl.c
index e933d57..2ceeca1 100644
--- a/android/protocol/ui-commands-impl.c
+++ b/android/protocol/ui-commands-impl.c
@@ -124,8 +124,9 @@
     // Read requests while they are immediately available.
     for (;;) {
         // Read next chunk of data.
-        status = read(uicmd->sock, uicmd->reader_buffer + uicmd->reader_offset,
-                      uicmd->reader_bytes - uicmd->reader_offset);
+        status = socket_recv(uicmd->sock,
+                             uicmd->reader_buffer + uicmd->reader_offset,
+                             uicmd->reader_bytes - uicmd->reader_offset);
         if (status == 0) {
             /* Disconnection, meaning that the core process got terminated. */
             fprintf(stderr, "core-ui-control service got disconnected\n");