Generate config.h

This allows us to remove a lot of #ifdef's. Either we want to use
a config.h or we don't. Since we'll want it for e.g. optional gsound
support later on let's have it.

meson.build

@@ -9,6 +9,8 @@ project(
 
 i18n = import('i18n')
 
+conf_data = configuration_data()
+
 if get_option('buildtype').startswith('debug')
     add_project_arguments('-DDEBUG=1', language : 'c')
 endif
@@ -26,6 +28,16 @@ else
 endif
 dbusdir = join_paths(depdatadir, 'dbus-1/interfaces')
 
+summary = [
+        '',
+        '------------------',
+        'squeekboard @0@'.format(meson.project_version()),
+        '',
+        '------------------',
+        ''
+]
+message('\n'.join(summary))
+
 subdir('data')
 subdir('protocols')
 subdir('eek')