Update minimum version.

[[Imported from SVN: r1676]]

Update minimum version.
ac73f09f · Markus Blatt · b478a321 · ac73f09f
Commit ac73f09f authored 12 years ago by Markus Blatt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,7 @@
 project("dune-istl" C CXX)

 # general stuff
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 2.8.8)

 # make sure our own modules are found
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/modules")