workaround for new XCode 12 policy for simulator builds

CMakeLists.txt

@@ -189,6 +189,13 @@ if(CMAKE_SYSTEM_NAME STREQUAL "iOS")
   set(Boost_LIBRARY_DIRS "/Users/roky/projects/Zano/mobile_repo/ofxiOSBoost/libs/boost/ios/")
   set(Boost_LIBRARIES "libboost.a")
   set(Boost_VERSION "ofxiOSBoost  1.60.0")
+  #workaround for new XCode 12 policy for builds(now it includes a slice for the "arm64" when builds for simulator)
+  set(__iphoneos_archs "armv7 armv7s arm64")
+  set(__iphonesimulator_archs "i386 x86_64")
+  set(CMAKE_XCODE_ATTRIBUTE_ARCHS[sdk=iphoneos*] "${__iphoneos_archs}")
+  set(CMAKE_XCODE_ATTRIBUTE_VALID_ARCHS[sdk=iphoneos*] "${__iphoneos_archs}")
+  set(CMAKE_XCODE_ATTRIBUTE_ARCHS[sdk=iphonesimulator*] "${__iphonesimulator_archs}")
+  set(CMAKE_XCODE_ATTRIBUTE_VALID_ARCHS[sdk=iphonesimulator*] "${__iphonesimulator_archs}")
 elseif(CMAKE_SYSTEM_NAME STREQUAL "Android")
   set(Boost_INCLUDE_DIRS "/Users/roky/projects/Zano/mobile_repo/Boost-for-Android-Prebuilt/1.69.0/include")
   set(Boost_LIBRARY_DIRS "/Users/roky/projects/Zano/mobile_repo/Boost-for-Android-Prebuilt/1.69.0/libs/llvm/${CMAKE_ANDROID_ARCH_ABI}/")