[gnome-settings-daemon] common: Check for wayland before building GsdUdevDeviceManager

[Carlos Garnacho <carlosg src gnome org>]

commit a85e0b599a4e19eb2f864090748df72bd98375fb
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Jul 19 19:32:41 2017 +0200

    common: Check for wayland before building GsdUdevDeviceManager
    
    Udev is rather common, so this check doesn't suffice if anyone wants
    to build with no wayland support whatsoever.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=780544

 configure.ac               |    1 +
 plugins/common/Makefile.am |    2 +-
 2 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index bee9abe..d04f8b6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -140,6 +140,7 @@ if test x$enable_wayland != xno; then
                 fi
         fi
 fi
+AM_CONDITIONAL(HAVE_WAYLAND, test x$have_wayland = xyes)
 
 dnl ================================================================
 dnl Plugins
diff --git a/plugins/common/Makefile.am b/plugins/common/Makefile.am
index 706be12..36cf17c 100644
--- a/plugins/common/Makefile.am
+++ b/plugins/common/Makefile.am
@@ -40,7 +40,7 @@ libcommon_la_SOURCES = \
        gsd-shell-helper.c      \
        gsd-shell-helper.h
 
-if HAVE_GUDEV
+if HAVE_WAYLAND
 libcommon_la_SOURCES += \
        gsd-device-manager-udev.c \
        gsd-device-manager-udev.h