Set the Android target architecture.
This is a string property that could be set to the one of the following values:
armv7-a: “ARMv7-A (armv7-a)”
armv7-a-hard: “ARMv7-A, hard-float ABI (armv7-a)”
arm64-v8a: “ARMv8-A, 64bit (arm64-v8a)”
x86: “x86 (x86)”
x86_64: “x86_64 (x86_64)”
This property is initialized by the value of the
CMAKE_ANDROID_ARCH variable if it is set
when a target is created.