Protect definition of SpinlockSemaArray, just like its declaration.

anarazel · anarazel · commit 5c1faa7ba729 · 2014-09-01T00:03:53.000+02:00
Found via clang's -Wmissing-variable-declarations.
diff --git a/src/backend/storage/lmgr/spin.c b/src/backend/storage/lmgr/spin.c
@@ -30,7 +30,9 @@
 #include "storage/spin.h"
 
 
+#ifndef HAVE_SPINLOCKS
 PGSemaphore SpinlockSemaArray;
+#endif
 
 /*
  * Report the amount of shared memory needed to store semaphores for spinlock
