x86/pv: Fix Clang build with !CONFIG_PV32

x86/pv: Fix Clang build with !CONFIG_PV32

Clang 3.5 doesn't do enough dead-code-elimination to drop the compat_gdt
reference, resulting in a linker failure:

  hidden symbol `per_cpu__compat_gdt' isn't defined

Drop the local variable, and move the evaluation of this_cpu(compat_gdt) to
within the guarded region.

Reported-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Tested-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>