Build - update cmake OSX target and cmake ver

* cmake ver now matches that of the external app's cmake's version requirement
* OSX target now 10.14 which is the currently oldest supported version of macOS

Author: samaaron

app/CMakeLists.txt

@@ -14,7 +14,7 @@ set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 set_property(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY VS_STARTUP_PROJECT ${PROJECT_NAME})
 
 if(APPLE)
-  set(CMAKE_OSX_DEPLOYMENT_TARGET '10.13')
+  set(CMAKE_OSX_DEPLOYMENT_TARGET '10.14')
 endif()
 
 set(APP_ROOT ${CMAKE_CURRENT_LIST_DIR})

app/external/CMakeLists.txt

@@ -1,5 +1,5 @@
 # This CMakeLists builds all the external libraries required for a Sonic Pi
-cmake_minimum_required(VERSION 3.12)
+cmake_minimum_required(VERSION 3.13)
 
 message(STATUS " Aubio Builder")
 
@@ -11,7 +11,7 @@ project(AubioBuilder
 
   include(ExternalProject)
 
-  set(CMAKE_OSX_DEPLOYMENT_TARGET '10.13')
+  set(CMAKE_OSX_DEPLOYMENT_TARGET '10.14')
 
   # sp_midi
 ExternalProject_Add(sp_midi