[packages] mysql: use proper proc file in hostname patch

git-svn-id: svn://svn.openwrt.org/openwrt/packages@25183 3c298f89-4303-0410-b956-a3cf2f4a3e73

libs/mysql/patches/502-fix-hostname.patch

@@ -5,7 +5,7 @@
  
  # Try to determine the hostname
 -hostname=`@HOSTNAME@`
-+hostname=`cat /proc/net/hostname`
++hostname=`cat /proc/sys/kernel/hostname`
  
  # Check if hostname is valid
  if test "$cross_bootstrap" -eq 0 -a "$in_rpm" -eq 0 -a "$force" -eq 0