package/go: rename BR2_PACKAGE_HOST_GO_{ARCH_SUPPORTS,CGO_LINKING_SUPPORTS}

package/go: rename BR2_PACKAGE_HOST_GO_{ARCH_SUPPORTS,CGO_LINKING_SUPPORTS}

The hidden Config.in option BR2_PACKAGE_HOST_GO_ARCH_SUPPORTS name is
not very clear as to whether it says whether Go is available for the
target architecture or the host architecture.

Until now, this was fine since there was support for host Go
packages. But as we are about to introduce support for building host
Go packages, we need to clarify the meaning of
BR2_PACKAGE_HOST_GO_ARCH_SUPPORTS. Since it says whether the target
architecture has support for Go or not, we rename it to
BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS.

And since BR2_PACKAGE_HOST_GO_CGO_LINKING_SUPPORTS is tightly related,
we rename it to BR2_PACKAGE_HOST_GO_TARGET_CGO_LINKING_SUPPORTS.

Signed-off-by: Angelo Compagnucci <angelo@amarulasolutions.com>
Tested-by: Adam Duskett <aduskett@gmail.com>
[Thomas: entirely rewrite commit log]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>