syslog-ng: update configure.patch for older patch tool

The previous configure.patch can't be applied by older "patch" tool
since the line number is incorrect, for example, the "patch 2.5.4" on
CentOS 5.10.

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>