Build/CMake: Increase minimum version to 3.8

(cherry picked from commit 965ac6fb08)

# Conflicts:
#	CMakeLists.txt

CMakeLists.txt

@@ -8,6 +8,7 @@
 # WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
+# We require CMake >= 3.2
 cmake_minimum_required(VERSION 3.8)
 
 # add this options before PROJECT keyword