Build for older OSX version to support x86_64 platforms #46

Job	Run time
win-x64 Native Build	8m 3s
win-x86 Native Build	4m 19s
android-arm64-v8a Native Build	15m 53s
android-x86_64 Native Build	14m 54s
android-armeabi-v7a Native Build	16m 11s
linux-x64 Native Build	10m 31s
osx Native Build	10m 51s
ios Native Build	10m 48s
managed_build	2m 25s
	1h 33m 55s

Provide feedback