Print all 2ND variables.

$(info   TARGET_BUILD_TYPE=$(TARGET_BUILD_TYPE))

$(info   TARGET_BUILD_APPS=$(TARGET_BUILD_APPS))

$(info   TARGET_ARCH=$(TARGET_ARCH))

$(info   TARGET_2ND_ARCH=$(TARGET_2ND_ARCH))

$(info   TARGET_ARCH_VARIANT=$(TARGET_ARCH_VARIANT))

$(info   TARGET_CPU_VARIANT=$(TARGET_CPU_VARIANT))

$(info   TARGET_2ND_ARCH=$(TARGET_2ND_ARCH))

$(info   TARGET_2ND_ARCH_VARIANT=$(TARGET_2ND_ARCH_VARIANT))

$(info   TARGET_2ND_CPU_VARIANT=$(TARGET_2ND_CPU_VARIANT))

$(info   HOST_ARCH=$(HOST_ARCH))

$(info   HOST_OS=$(HOST_OS))

$(info   HOST_OS_EXTRA=$(HOST_OS_EXTRA))