[PATCH] Update minimum required version of cmake

[Keith Walker]

This patch updates the minimum version of cmake that is required from 2.8 to
2.8.6 in order to take into account of new checks (check_cxx_symbol_exists)
that were added in revision 174564

Please review this simple patch (it is my first posting to the llvm-commits
list so hopefully I have followed the correct layout/format for patch
postings).

Keith

Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt      (revision 174674)
+++ CMakeLists.txt      (working copy)
@@ -1,7 +1,7 @@
 # See docs/CMake.html for instructions about how to build LLVM with CMake.

 project(LLVM)
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 2.8.6)

 # Add path for custom modules
 set(CMAKE_MODULE_PATH
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