Disable tracing pragmas when not in debug mode. This eliminates an external

dependency on stdout. (CVS 3959)

FossilOrigin-Name: 5a0fe9854849bf3f04008a5dbb7a74e7d0d815ca

src/vdbeaux.c

@@ -88,12 +88,14 @@ void sqlite3VdbeSwap(Vdbe *pA, Vdbe *pB){
   pB->nSql = nTmp;
 }
 
+#ifdef SQLITE_DEBUG
 /*
 ** Turn tracing on or off
 */
 void sqlite3VdbeTrace(Vdbe *p, FILE *trace){
   p->trace = trace;
 }
+#endif
 
 /*
 ** Resize the Vdbe.aOp array so that it contains at least N