patches: llvm-8: Remove stray patch file

Don't know how I didn't catch this :( doesn't affect anything because it
will never be called but annoying to have this in the wrong place
regardless.

[skip ci]

Fixes: 532bec7 ("patches: llvm-8: x86_64: Fix patch file")
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>

Author: nathanchance