x86/vdso: Remove unused file

commit da861e18 ("x86, vdso: Get rid of the fake section mechanism")
left this file behind; nothing is using it anymore.
Signed-off-by: NJann Horn <jannh@google.com>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: hpa@zytor.com
Cc: luto@amacapital.net
Link: https://lkml.kernel.org/r/20180504175935.104085-1-jannh@google.com

arch/x86/entry/vdso/vdso32/vdso-fakesections.c

-#include "../vdso-fakesections.c"