slirp: clarify license of slirp files using SPDX: explicit MIT

Add SPDX license identifier to clarify the license of files with
explicit MIT license header.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/util.c b/src/util.c
index 97148f5..e596087 100644
--- a/src/util.c
+++ b/src/util.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: MIT */
 /*
  * util.c (mostly based on QEMU os-win32.c)
  *