locking/qspinlock/x86: Only emit the test-and-set fallback when building guest support

Only emit the test-and-set fallback for Hypervisors lacking
PARAVIRT_SPINLOCKS support when building for guests.

Suggested-by: Linus Torvalds <[e-mail]>
Signed-off-by: Peter Zijlstra (Intel) <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: [e-mail]
Cc: [e-mail] # 4.2
Signed-off-by: Ingo Molnar <[e-mail]>

arch/x86/include/asm/qspinlock.h

···
 }
 #endif
 
+#ifdef CONFIG_PARAVIRT
 #define virt_spin_lock virt_spin_lock
-
 static inline bool virt_spin_lock(struct qspinlock *lock)
 {
 	if (!static_cpu_has(X86_FEATURE_HYPERVISOR))
···
 
 	return true;
 }
+#endif /* CONFIG_PARAVIRT */
 
 #include <asm-generic/qspinlock.h>