slirp: move sources to src/ subdirectory

Prepare for making slirp/ a standalone project.

Remove some useless includes while at it.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20190212162524.31504-5-marcandre.lureau@redhat.com>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

util/main-loop.c

@@ -26,11 +26,9 @@
 #include "qapi/error.h"
 #include "qemu/cutils.h"
 #include "qemu/timer.h"
-#include "qemu/sockets.h"	// struct in_addr needed for libslirp.h
 #include "sysemu/qtest.h"
 #include "sysemu/cpus.h"
 #include "sysemu/replay.h"
-#include "slirp/libslirp.h"
 #include "qemu/main-loop.h"
 #include "block/aio.h"
 #include "qemu/error-report.h"