[source] iwinfo: add "PKG_MIRROR_HASH" to the Makefile

[LEDE Commits]

blogic pushed a commit to source.git, branch master:
https://git.lede-project.org/63d7c458867b62bda7662a897c05ac79aab21f5a

commit 63d7c458867b62bda7662a897c05ac79aab21f5a
Author: Arjun AK <lede at arjunak.com>
AuthorDate: Mon Oct 23 19:33:34 2017 +0530

    iwinfo: add "PKG_MIRROR_HASH" to the Makefile
    
    Defining it will let the build tool download the tarball file from
    a buildbot server, avoiding a clone of the source repo.
    
    Signed-off-by: Arjun AK <lede at arjunak.com>
---
 package/network/utils/iwinfo/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/package/network/utils/iwinfo/Makefile b/package/network/utils/iwinfo/Makefile
index a42aa13..1b8a3ad 100644
--- a/package/network/utils/iwinfo/Makefile
+++ b/package/network/utils/iwinfo/Makefile
@@ -13,6 +13,7 @@ PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(LEDE_GIT)/project/iwinfo.git
 PKG_SOURCE_DATE:=2017-08-23
 PKG_SOURCE_VERSION:=c1a03e8231a5d8b348b70a182d256725c98a3b0b
+PKG_MIRROR_HASH:=7bd294f50f8ec8c0497c5fbe5527f3ae098814cdfeecf4ccf78a2a8937611664
 PKG_MAINTAINER:=Jo-Philipp Wich <jo at mein.io>
 PKG_LICENSE:=GPL-2.0