procd: backport fixes from master branch

The following commits have been cherry-picked into the lede-17.01
branch of procd, listed here in git-log-order ie. with head first:

89918c8 system: introduce new attribute board_name
(79bbe6d and 453116e on master branch)

8297c38 preinit: define _GNU_SOURCE
(e5b963a on master branch)

8fd57dd upgraded: cmake: Find and include uloop.h
(e5ff8ca on master branch)

6b0da20 hotplug: fix a memory leak in handle_button_complete()
(f367ec6 on master branch)

558ffb5 service/service_stopped(): fix a use-after-free
(796ba3b on master branch)

22f89e1 upgraded: define __GNU_SOURCE
(e7bb2c8 on master branch)

6e8ea8b rcS: add missing fcntl.h include
(992b796 on master branch)

cd5225d procd/rcS: Use /dev/null as stdin
(d42b21e on master branch)

5131bec procd: Log initscript output prefixed with script name
(1247db1 on master branch)

225b18d procd: Don't use syslog before its initialization
(8d720b2 on master branch)

889442c procd: Add missing \n in debug message
(2555474 on master branch)

2716228 procd: service gets deleted when its last instance is freed
(8f218f5 on master branch)

Signed-off-by: Daniel Golle <[email protected]>

Author: dangowrt

package/system/procd/Makefile

@@ -12,9 +12,9 @@ PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(LEDE_GIT)/project/procd.git
-PKG_SOURCE_DATE:=2017-02-15
-PKG_SOURCE_VERSION:=5f9124103410c178d816bb5229fba7dd2286a49b
-PKG_MIRROR_HASH:=ec887b349fc60ad3882fc9eaefb5cd299d64e7d43c062df9f7b7500591ba3e85
+PKG_SOURCE_DATE:=2017-06-19
+PKG_SOURCE_VERSION:=89918c8cb78e651ee0922f13a96b7f25fc2f285a
+PKG_MIRROR_HASH:=fad1a37227f85070f6a49a37ea1e98c22c066c91f16ad26898152972eb0c6a91
 CMAKE_INSTALL:=1
 
 PKG_LICENSE:=GPL-2.0