Remove empty file remnants that were left in the tree by mistake

Remove empty file remnants that were left in the tree by mistake

Noted by various people (Sam, Jeff, Roland..)

Commit d74001e60e84ccc6c97179317d8b4342d652da0d intended to remove the
xfs "Makefile-linux-2.6" file, but it was mistakenly still left in the
tree as a empty file, and would cause git to correctly complain about a
tracked file being removed after a "make distclean" (which removes empty
files as garbage).

And the asm-x86/desc_64.h file was supposed to be removed by commit
f1d54aa17165b04ded897696e362c4384381ea8d, but instead stayed around
containing just a single newline.

Get rid of them both properly.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>