[LyX/master] Compilation fix

[Jean-Marc Lasgouttes]

commit 5d8918f68f0a2e54f1a13e6345eec63ad27ffc71
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Sat Mar 11 20:51:39 2017 +0100

    Compilation fix
    
    It is actually better to compile code before pushing changes...
---
 src/VCBackend.cpp |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/src/VCBackend.cpp b/src/VCBackend.cpp
index 3eeb3d6..e4104bd 100644
--- a/src/VCBackend.cpp
+++ b/src/VCBackend.cpp
@@ -31,6 +31,7 @@
 #include "support/TempFile.h"
 
 #include <fstream>
+#include <iomanip>
 #include <sstream>
 
 using namespace std;