cmake: Weak link with CoreHaptics

Add link to CoreHaptics so we can compile against latest iOS SDKs.

CMakeLists.txt

@@ -1742,6 +1742,7 @@ elseif(APPLE)
         set(SDL_FRAMEWORK_COREMOTION 1)
       endif()
       set(SDL_FRAMEWORK_GAMECONTROLLER 1)
+      set(SDL_FRAMEWORK_COREHAPTICS 1)
       set(HAVE_SDL_SENSORS 1)
     else()
       file(GLOB JOYSTICK_SOURCES ${SDL2_SOURCE_DIR}/src/joystick/darwin/*.c ${SDL2_SOURCE_DIR}/src/joystick/iphoneos/*.m)
@@ -1966,6 +1967,12 @@ elseif(APPLE)
     find_library(UIKIT UIKit)
     list(APPEND EXTRA_LIBS ${UIKIT})
   endif()
+  if(SDL_FRAMEWORK_COREHAPTICS)
+    find_library(COREHAPTICS CoreHaptics)
+    if(COREHAPTICS)
+      list(APPEND EXTRA_LDFLAGS "-Wl,-weak_framework,CoreHaptics")
+    endif()
+  endif()
 
   CheckPTHREAD()