Multiple issues fixed:
- module was compiled against `uname -r` kernel, not eselect-ed one
- released version requires a patch to compile with Clang
- previous attempt to forward CC to fix Clang compilation was incorrect
from every standpoint; e. g. it there is KERNEL_CC for that, etc.
Removed it, as upstream now has proper support (backported via patch).
Closes: https://bugs.gentoo.org/973282
Signed-off-by: Sv. Lockal <lockalsash@gmail.com>
b1ed3ba86c