namesys: Fixed ErrNamesys error.

include/ipfs/namesys/namesys.h

@@ -3,6 +3,7 @@
 
     #define DefaultDepthLimit 32
 
+    #ifdef NAMESYS_C
         char *ErrNamesys[] = {
             NULL,
             "ErrAllocFailed",
@@ -14,6 +15,9 @@
             "unrecognized validity type",
             "not a valid proquint string"
         };
+    #else
+        extern char *ErrNamesys;
+    #endif // NAMESYS_C
 
     enum {
         ErrAllocFailed = 1,

namesys/namesys.c

@@ -3,6 +3,7 @@
 #include <time.h>
 #include "ipfs/cid/cid.h"
 #include "ipfs/path/path.h"
+#define NAMESYS_C
 #include "ipfs/namesys/namesys.h"
 
 /* mpns (a multi-protocol NameSystem) implements generic IPFS naming.