freeradius3: fix hostname invocation in radtest

Canonical radtest start results in an error:

$ radtest bob hello localhost 0 testing123
/usr/bin/radtest: line 1: hostname: not found
(0) Error parsing "stdin": Failed to get value

hostname command is not present in OpenWrt.
Instead, hostname can be obtained from file /proc/sys/kernel/hostname.

added: 005-get-hostname-from-proc-in-radtest.patch

(backported from commit 8b2792a)
Signed-off-by: Alexey Dobrovolsky <dobrovolskiy.alexey@gmail.com>

net/freeradius3/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=freeradius3
 PKG_VERSION:=release_3_0_21
-PKG_RELEASE:=4
+PKG_RELEASE:=5
 
 PKG_SOURCE:=$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://github.com/FreeRADIUS/freeradius-server/archive

net/freeradius3/patches/005-get-hostname-from-proc-in-radtest.patch

@@ -0,0 +1,12 @@
+--- a/src/main/radtest.in
++++ b/src/main/radtest.in
+@@ -112,7 +112,7 @@ if [ "$7" ]
+ then
+ 	nas=$7
+ else
+-	nas=`hostname`
++	nas=$(cat /proc/sys/kernel/hostname)
+ fi
+ 
+ (
+