[gnome-session] meson: rename HAVE_SYSTEMD_JOURNAL to ENABLE_SYSTEMD_JOURNAL

[Ray Strode <halfline src gnome org>]

commit f8358ef6958530fc13d889265025a1da1c848be1
Author: Ray Strode <rstrode redhat com>
Date:   Mon Jan 8 16:30:30 2018 -0500

    meson: rename HAVE_SYSTEMD_JOURNAL to ENABLE_SYSTEMD_JOURNAL
    
    That's what the code uses.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=768982

 meson.build |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/meson.build b/meson.build
index 4f239af..f220c50 100644
--- a/meson.build
+++ b/meson.build
@@ -160,7 +160,7 @@ if enable_systemd or enable_consolekit
   endif
 endif
 config_h.set('HAVE_SYSTEMD', enable_systemd)
-config_h.set('HAVE_SYSTEMD_JOURNAL', enable_systemd_journal)
+config_h.set('ENABLE_SYSTEMD_JOURNAL', enable_systemd_journal)
 config_h.set('HAVE_CONSOLEKIT', enable_consolekit)
 
 configure_file(