File change-compiler-flag-dimstar.patch of Package evolution-ews

diff --git a/configure.ac b/configure.ac
index a219022..e66845f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -90,7 +90,7 @@ AS_COMPILER_FLAGS(WARNING_FLAGS,
 	-Werror-implicit-function-declaration
 	-Wformat-nonliteral -Wformat-security -Winit-self
 	-Wmissing-declarations -Wmissing-include-dirs
-	-Wmissing-noreturn -Wnested-externs -Wpointer-arith
+	-Wmissing-noreturn -Wpointer-arith
 	-Wundef -Wwrite-strings -Werror")
 AC_SUBST(WARNING_FLAGS)