Only workaround fts.h if we have a bad version that doesn't handle LFS.

Only workaround fts.h if we have a bad version that doesn't handle LFS.

Older versions of glibc included an fts implementation that didn't have
Large File System support. We worked around that in linux-kernel-modules.c
by including it early before config.h and then redefining some symbols
to get the 64-bit versions. This is somewhat fragile and not necessary
with newer glibc. If possible we want the 64bit fts version always.

Signed-off-by: Mark Wielaard <mjw@redhat.com>