[gnome-control-center] network: Make panel required on Linux

[Bastien Nocera <hadess src gnome org>]

commit f5e2dc9c1277c01ac681b62733093f0c2454306b
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Feb 8 20:00:29 2017 +0100

    network: Make panel required on Linux
    
    But do it earlier than the end of configure messages.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 4c0f2e2..309bf14 100644
--- a/configure.ac
+++ b/configure.ac
@@ -229,7 +229,7 @@ PKG_CHECK_MODULES(NETWORK_MANAGER,
                   mm-glib >= $MODEM_MANAGER_REQUIRED_VERSION,
                   [have_networkmanager=yes], have_networkmanager=no)
 if test "x$have_networkmanager" = xno ; then
-        AC_MSG_WARN(*** Network panel will not be built (NetworkManager or ModemManager not found) ***)
+        linux_error_or_warn "*** Network panel will not be built (NetworkManager or ModemManager not found) 
***"
 else
        AC_DEFINE(BUILD_NETWORK, 1, [Define to 1 to build the Network panel])
 fi