Each toolchain with their file

[Aleix Pol]

Hi,
Here's a packaging match for KConfig: https://paste.kde.org/p4clobet3

The idea is that, when cross-compiling, together with
kconfig_compiler_kf5, we need to install the cmake file that points to
it. Otherwise we end up with a file that points to the armhf (or any
target platform) and then a poor kconfig_compiler_kf5 file that cannot
be found.

Rohan says that the patch makes sense. :D

Aleix