Require CMake 2.8.8 due to new Xcode

CMakeLists.txt

@@ -1,4 +1,4 @@
-CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
+CMAKE_MINIMUM_REQUIRED(VERSION 2.8.8)
 
 PROJECT(Polycode)
 

Dependencies/CMakeLists.txt

@@ -1,4 +1,4 @@
-CMAKE_MINIMUM_REQUIRED(VERSION 2.8.5) # 2.8.5 needed for full URL support
+CMAKE_MINIMUM_REQUIRED(VERSION 2.8.8) # 2.8.5 needed for full URL support, 2.8.8 now needed for new Xcode support
 
 PROJECT(PolycodeDependencies)