Allow user to specify FUNCHOOK_CPU explicitly #19
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Currently funchook attempts to determine FUNCHOOK_CPU using CMAKE_SYSTEM_PROCESSOR. This isn't particularly robust especially when you start working with various toolchains. CMAKE_SYSTEM_PROCESSOR doesn't seem to have a definitive list of accepted values i.e. for aarch64 I've seen aarch64/arm64/armv8/armv8_64.
Allowing the user of funchook to explicitly set FUNCHOOK_CPU seems like a safer option for some users. The alternative for an external user is to push/pop setting CMAKE_SYSTEM_PROCESSOR which isn't very nice.