[vte] build: Remove duplicate flag

[Christian Persch <chpe src gnome org>]

commit 8395162c4ea12cbc03a512f5995cdc61a216dd4f
Author: Christian Persch <chpe gnome org>
Date:   Mon Apr 28 18:24:50 2014 +0200

    build: Remove duplicate flag

 configure.ac |    5 +----
 1 files changed, 1 insertions(+), 4 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 0d9469a..e9c48fb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -100,9 +100,7 @@ CC_CHECK_FLAGS_APPEND([AM_CFLAGS],[CFLAGS],[ \
   -Wcast-align \
   -Wendif-labels \
   -Werror=declaration-after-statement \
-  -Werror=format=2 \
-  -Werror=format-nonliteral \
-  -Werror=format-security \
+  "-Werror=format=2 -Werror=format-nonliteral -Werror=format-security" \
   -Werror=implicit-function-declaration \
   -Werror=init-self \
   -Werror=missing-include-dirs \
@@ -110,7 +108,6 @@ CC_CHECK_FLAGS_APPEND([AM_CFLAGS],[CFLAGS],[ \
   -Werror=pointer-arith \
   -Wextra \
   -Wfloat-equal \
-  -Wformat-nonliteral \
   -Wimplicit \
   -Wlogical-op \
   -Wmissing-declarations \