x86/debug: Drop unnecessary include of compile.h

compile.h changes across incremental builds, but nothing in debug.c uses it.
This avoids debug.c getting rebuilt on every incremental build.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

xen/arch/x86/debug.c

@@ -15,7 +15,6 @@
  */
 
 #include <xen/sched.h>
-#include <xen/compile.h>
 #include <xen/mm.h>
 #include <xen/domain_page.h>
 #include <xen/guest_access.h>