MFC r346571,r346572:

Update the spelling of my name

Previous spellings of my name (NGie, Ngie) weren't my legal spelling. Use Enji
instead for clarity.

While here, remove "All Rights Reserved" from copyrights I "own".

MFC r319010:

Fix #if conditional added in r319008

I committed an earlier version of the file by accident

This is a no-op on ^/head and ^/stable/11.

MFC r319008:

kvm_geterr_test: Compile out the portions that require kvm_open2(3) on
systems that lack the libcall, based on __FreeBSD_version.

kvm_open2(3) wasn't made available until r291406, which is in ^/stable/11,
but not ^/stable/10. This makes some of kvm_geterr_test available for testing
on ^/stable/10.