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

[Bastien Nocera <hadess src gnome org>]

commit 0c2247eafa33dbeb35bf68daa1d636e6a32e6807
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Feb 8 20:01:04 2017 +0100

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

 configure.ac |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 309bf14..cb59531 100644
--- a/configure.ac
+++ b/configure.ac
@@ -257,6 +257,8 @@ PKG_CHECK_MODULES(BLUETOOTH, $COMMON_MODULES gnome-bluetooth-1.0 >= 3.18.2,
                  [have_bluetooth=yes], have_bluetooth=no)
 if test "x$have_bluetooth" = xyes ; then
        AC_DEFINE(BUILD_BLUETOOTH, 1, [Define to 1 to build the Bluetooth panel])
+else
+       linux_usb_error_or_warn "*** Bluetooth panel will not be built"
 fi
 AM_CONDITIONAL(BUILD_BLUETOOTH, [test x$have_bluetooth = xyes])
 if test x${have_bluetooth} = xyes; then