[gnome-control-center] common: Check for wayland before building GsdUdevDeviceManager

[Carlos Garnacho <carlosg src gnome org>]

commit f24b528695296d4c5a373e4562b089a04c77dc86
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Jul 19 19:44:35 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 +
 panels/common/Makefile.am |    2 +-
 2 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index a48b7d9..e725b3c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -191,6 +191,7 @@ if test "x$have_wayland" = xyes ; then
                AC_MSG_ERROR([udev is required for Wayland support])
        fi
 fi
+AM_CONDITIONAL(HAVE_WAYLAND, [test "x$have_wayland" = "xyes"])
 
 # Panels that must be built on Linux systems
 linux_error_or_warn()
diff --git a/panels/common/Makefile.am b/panels/common/Makefile.am
index 7d0eaad..be0e44a 100644
--- a/panels/common/Makefile.am
+++ b/panels/common/Makefile.am
@@ -62,7 +62,7 @@ libdevice_la_SOURCES =                        \
 libdevice_la_LIBADD =                  \
        $(DEVICES_LIBS)
 
-if HAVE_UDEV
+if HAVE_WAYLAND
 AM_CPPFLAGS += $(UDEV_CFLAGS)
 libdevice_la_LIBADD += $(UDEV_LIBS)
 libdevice_la_SOURCES +=                        \