meson: bump to 0.61, use install_symlink()

meson: bump to 0.61, use install_symlink()

Bump the meson requirement to 0.61 which allows us to remove our clunky
shell script in favour of the native install_symlink().

In terms of OS support - according to repology, all distributions which
have 0.60 (Fedora 36 + winget) also have 0.61 in their repositories.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Link: https://github.com/kmod-project/kmod/pull/209
Signed-off-by: Lucas De Marchi <lucas.de.marchi@gmail.com>