Fix build with CMake 4: compatibility with cmake_minimum_required()
versions below 3.5 has been removed.  Bump the minimum to 3.5 and move
the call before project() as CMake expects.

--- CMakeLists.txt.orig	2017-03-08 22:48:59 UTC
+++ CMakeLists.txt
@@ -1,5 +1,5 @@
+cmake_minimum_required(VERSION 3.5)
 project(lzfse C)
-cmake_minimum_required(VERSION 2.8.6)
 
 include(CheckCCompilerFlag)