Made the python build get a DLIB_VERSION macro defined. Also cleaned up cmake

a little bit.

dlib/CMakeLists.txt

@@ -3,11 +3,7 @@
 # information about it at http://www.cmake.org
 #
 
-# setting this makes CMake allow normal looking if else statements
-SET(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS true)
-
-cmake_minimum_required(VERSION 2.4)
-set(CMAKE_LEGACY_CYGWIN_WIN32 0) # Remove when CMake >= 2.8.4 is required
+cmake_minimum_required(VERSION 2.8.4)
 
 # default to a Release build (except if CMAKE_BUILD_TYPE is set)
 include(release_build_by_default)
@@ -18,8 +14,8 @@ set(CPACK_PACKAGE_VERSION_MAJOR "18")
 set(CPACK_PACKAGE_VERSION_MINOR "18")
 set(CPACK_PACKAGE_VERSION_PATCH "99")
 set(VERSION ${CPACK_PACKAGE_VERSION_MAJOR}.${CPACK_PACKAGE_VERSION_MINOR}.${CPACK_PACKAGE_VERSION_PATCH})
+set(DLIB_VERSION ${VERSION} PARENT_SCOPE)
 
-set(CMAKE_LEGACY_CYGWIN_WIN32 0) # Remove when CMake >= 2.8.4 is required
 # Suppress cmake warnings about changes in new versions.
 if(COMMAND cmake_policy) 
    cmake_policy(SET CMP0003 NEW) 

tools/python/CMakeLists.txt

@@ -5,6 +5,8 @@ CMAKE_MINIMUM_REQUIRED(VERSION 2.8.4)
 set(USE_SSE4_INSTRUCTIONS ON CACHE BOOL "Use SSE4 instructions")
 include(../../dlib/add_python_module)
 
+add_definitions(-DDLIB_VERSION=${DLIB_VERSION})
+
 # Tell cmake to compile all these cpp files into a dlib python module.
 set(python_srcs
    src/dlib.cpp