build-sys: workaround libtool issue with argv[0]

build-sys: workaround libtool issue with argv[0]

Symlinking tools to kmod doesn't work because argv[0] is not the name of
the symlink, but rather 'kmod' (since libtool's wrapper script calls the
tools/.libs/kmod directly)

Now we create another binary kmod-nolib that is statically linked to
libkmod so we can call the binary directly and do not worry about
LD_LIBRARY_PATH.