Fix Linux kernel directories detection

Fix Linux kernel directories detection

Most modern Linux distributions have separate locations for bare
source and prebuilt ("build") files. Additionally, there are `source`
and `build` symlinks in `/lib/modules/$(KERNEL_VERSION)` pointing to
them. The order of directory search is now:
- `configure` command line values if both `--with-linux` and
  `--with-linux-obj` were defined
- If only `--with-linux` was defined, `--with-linux-obj` is assumed
  to have the same value as `--with-linux`
- If neither `--with-linux` nor `--with-linux-obj` were defined
  autodetection is used:
  - `/lib/modules/$(uname -r)/{source,build}` respectively, if exist
  - The first directory in `/lib/modules` with the highest version
    number according to `sort -V` which contains `source` and `build`
    symlinks/directories
  - The first directory matching `/usr/src/kernels/*` and
    `/usr/src/linux-*` with the highest version number according to
    `sort -V`. Here the source and prebuilt directories are assumed
    to be the same.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: szubersk <szuberskidamian@gmail.com>
Closes #9935
Closes #13096