ENH: fix libkml for Apple

patches/LIBKML/CMakeLists.txt

@@ -3,7 +3,7 @@ cmake_minimum_required(VERSION 2.8.3)
 project(libkml)
 
 set(libkml_VERSION_MAJOR "1")
-set(libkml_VERSION_MINOR "2")
+set(libkml_VERSION_MINOR "3")
 set(libkml_VERSION_PATCH "0")
 
 # Version string should not include patch level.  The major.minor is
@@ -38,9 +38,6 @@ if(WIN32 AND (NOT BORLAND))
     set(LIBKML_COMPILE_ZLIB OFF)
   endif()
 endif()
-if(APPLE)
-  set(LIBKML_COMPILE_ZLIB ON)
-endif()
     
 
 include_directories(${CMAKE_CURRENT_SOURCE_DIR}/third_party/uriparser-0.7.5/include)