Corrected code to acquire mtu under Solaris.

diff --git a/dlls/iphlpapi/ifenum.c b/dlls/iphlpapi/ifenum.c
index e5749d9..e6bb8b6 100644
--- a/dlls/iphlpapi/ifenum.c
+++ b/dlls/iphlpapi/ifenum.c
@@ -821,7 +821,11 @@
     if ((ioctl(fd, SIOCGIFMTU, &ifr)))
       ret = ERROR_INVALID_DATA;
     else {
+#ifndef __sun
       *mtu = ifr.ifr_mtu;
+#else
+      *mtu = ifr.ifr_metric;
+#endif
       ret = NO_ERROR;
     }
   }