Remove explicit setting of CMake policies.

According to the documentation, calling "cmake_minimum_required(VERSION X.Y.Z)
is sufficient to have all policies implemented for version of CMake <= X.Y.Z
set to NEW.

See http://www.cmake.org/cmake/help/v2.8.4/cmake.html#command:cmake_minimum_required

See #403

CMakeLists.txt

@@ -21,32 +21,6 @@
 cmake_minimum_required(VERSION 2.8.4)
 
 #-----------------------------------------------------------------------------
-# See http://cmake.org/cmake/help/cmake-2-8-docs.html#section_Policies for details
-#
-
-set(project_policies
-  CMP0001 # NEW: CMAKE_BACKWARDS_COMPATIBILITY should no longer be used.
-  CMP0002 # NEW: Logical target names must be globally unique.
-  CMP0003 # NEW: Libraries linked via full path no longer produce linker search paths.
-  CMP0004 # NEW: Libraries linked may NOT have leading or trailing whitespace.
-  CMP0005 # NEW: Preprocessor definition values are now escaped automatically.
-  CMP0006 # NEW: Installing MACOSX_BUNDLE targets requires a BUNDLE DESTINATION.
-  CMP0007 # NEW: List command no longer ignores empty elements.
-  CMP0008 # NEW: Libraries linked by full-path must have a valid library file name.
-  CMP0009 # NEW: FILE GLOB_RECURSE calls should not follow symlinks by default.
-  CMP0010 # NEW: Bad variable reference syntax is an error.
-  CMP0011 # NEW: Included scripts do automatic cmake_policy PUSH and POP.
-  CMP0012 # NEW: if() recognizes numbers and boolean constants.
-  CMP0013 # NEW: Duplicate binary directories are not allowed.
-  CMP0014 # NEW: Input directories must have CMakeLists.txt
-  )
-foreach(policy ${project_policies})
-  if(POLICY ${policy})
-    cmake_policy(SET ${policy} NEW)
-  endif()
-endforeach()
-
-#-----------------------------------------------------------------------------
 if(APPLE)
   # Note: By setting CMAKE_OSX_* variables before any enable_language() or project() calls,
   #       we ensure that the bitness will be properly detected.