Add --vendor option to krb5-config, required by samba 4.
Status: Backport from upstream git.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>

diff -Nura heimdal-1.5.3.orig/tools/krb5-config.in heimdal-1.5.3.vendor/tools/krb5-config.in
--- heimdal-1.5.3.orig/tools/krb5-config.in	2012-12-09 19:06:44.000000000 -0300
+++ heimdal-1.5.3.vendor/tools/krb5-config.in	2013-12-18 15:49:45.283986300 -0300
@@ -50,6 +50,10 @@
     do_usage=yes
     usage_exit=0
     ;;
+  --vendor)
+    echo "Heimdal";
+    exit 0
+    ;;
   --version)
     echo "@PACKAGE@ @VERSION@"
     exit 0