[PATCH iproute2] bridge/mdb.c: include limits.h

[Trevor Gamblin <tgamblin@baylibre.com>]

While building iproute2 6.4.0 with musl using Yocto Project, errors such
as the following were encountered:

| mdb.c: In function 'mdb_parse_vni':
| mdb.c:666:47: error: 'ULONG_MAX' undeclared (first use in this function)
|   666 |         if ((endptr && *endptr) || vni_num == ULONG_MAX)
|       |                                               ^~~~~~~~~
| mdb.c:666:47: note: 'ULONG_MAX' is defined in header '<limits.h>'; did you forget to '#include <limits.h>'?

Include limits.h in bridge/mdb.c to fix this issue. This change is based
on one in Alpine Linux, but the author there had no plans to submit:
https://git.alpinelinux.org/aports/commit/main/iproute2/include.patch?id=bd46efb8a8da54948639cebcfa5b37bd608f1069

Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>
---
 bridge/mdb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/bridge/mdb.c b/bridge/mdb.c
index fbb4f704..18793458 100644
--- a/bridge/mdb.c
+++ b/bridge/mdb.c
@@ -15,6 +15,7 @@
 #include <string.h>
 #include <arpa/inet.h>
 #include <netdb.h>
+#include <limits.h>
 
 #include "libnetlink.h"
 #include "utils.h"
-- 
2.41.0