Drop qemu_foo() socket API wrapper

The socket API wrappers were initially introduced in commit
00aa0040 ("Wrap recv to avoid warnings"), but made redundant with
commit a2d96af4 ("osdep: add wrappers for socket functions") which fixes
the win32 declarations and thus removed the earlier warnings.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
diff --git a/gdbstub.c b/gdbstub.c
index 3c14c6a..c8375e3 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -426,7 +426,7 @@
     int ret;
 
     for(;;) {
-        ret = qemu_recv(gdbserver_state.fd, &ch, 1, 0);
+        ret = recv(gdbserver_state.fd, &ch, 1, 0);
         if (ret < 0) {
             if (errno == ECONNRESET)
                 gdbserver_state.fd = -1;