Make sure the vdbeInt.h file is not #included multiple times.  Ticket #2194. (CVS 3608)

FossilOrigin-Name: 93edd3b0565d08383b3034c57f221073fde6de4b
diff --git a/src/vdbeInt.h b/src/vdbeInt.h
index 71d162d..d2f737c 100644
--- a/src/vdbeInt.h
+++ b/src/vdbeInt.h
@@ -15,6 +15,8 @@
 ** 6000 lines long) it was split up into several smaller files and
 ** this header information was factored out.
 */
+#ifndef _VDBEINT_H_
+#define _VDBEINT_H_
 
 /*
 ** intToKey() and keyToInt() used to transform the rowid.  But with
@@ -403,3 +405,5 @@
 int sqlite3VdbeFifoPush(Fifo*, i64);
 int sqlite3VdbeFifoPop(Fifo*, i64*);
 void sqlite3VdbeFifoClear(Fifo*);
+
+#endif /* !defined(_VDBEINT_H_) */