[evolution-ews] Add -Wno-unused-but-set-variable. With -Werror, it's too much

[David Woodhouse <dwmw2 src gnome org>]

commit 9237c6d29cbfbad90571dffd249cd14b44f75a48
Author: David Woodhouse <David Woodhouse intel com>
Date:   Mon Jul 11 14:28:53 2011 -0700

    Add -Wno-unused-but-set-variable. With -Werror, it's too much

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 863d784..32f6b61 100644
--- a/configure.ac
+++ b/configure.ac
@@ -87,6 +87,7 @@ AS_COMPILER_FLAGS(WARNING_FLAGS,
 	-Wno-sign-compare
 	-Wno-unused-parameter
 	-Wdeclaration-after-statement
+	-Wno-unused-but-set-variable
 	-Werror-implicit-function-declaration
 	-Wformat-nonliteral -Wformat-security -Winit-self
 	-Wmissing-declarations -Wmissing-include-dirs