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 58b7983d15a422d9616bdc4e245d5c31dfaefbe2 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
c81c6ca45a69478c7877b729af1942d2b80ef582, but instead stayed around
containing just a single newline.

Get rid of them both properly.

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