KLDs missing CTF information (patch attached)

[Navdeep Parhar]

It appears that the KLD build process is missing a ctfmerge at the end, and
this results in KLDs with incomplete CTF information.

Here is a patch that fixes this.  I verified it on amd64 with various KLDs.

Before:
# ctfdump /boot/kernel/if_cxgb.ko | wc -l
 2269
# ctfdump /boot/kernel/zfs.ko | wc -l
430

After:
# ctfdump /boot/kernel/if_cxgb.ko | wc -l
6568
# ctfdump /boot/kernel/zfs.ko | wc -l
15032

It is wasteful to have CTF information in both the .ko and the .ko.symbols file
but this is what the kernel does too.

Regards,
Navdeep
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