Fix obsolete declaration.

examples/pio/compareResourcesArray.c

@@ -15,7 +15,6 @@
 #include "resource_unpack.h"
 
 extern int    reshListCompare      ( int, int );
-extern void   arrayDestroy          ( void );
 
 enum {
   IOMode           = PIO_NONE,

src/pio_server.c

@@ -39,8 +39,6 @@
 #include "vlist_var.h"
 
 
-extern void arrayDestroy ( void );
-
 static struct
 {
   size_t size;

tests/test_resource_copy.c

@@ -21,8 +21,6 @@
 typedef int MPI_Comm;
 #endif
 
-extern void   arrayDestroy          ( void );
-
 enum {
   DOUBLE_PRECISION = 8,
   nlon             = 12,