Allow the configuration file to be specified via an environment variable.

--- geoclue-2.1.10/src/gclue-config.c	2015-04-07 09:50:07.721074380 +0200
+++ geoclue-2.1.10/src/gclue-config.c	2015-04-07 10:27:26.613171960 +0200
@@ -235,6 +235,11 @@
 gclue_config_init (GClueConfig *config)
 {
         GError *error = NULL;
+	const char *config_file_path;
+
+	config_file_path = g_getenv ("GEOCLUE_CONFIG_FILE");
+	if (config_file_path == NULL)
+	  config_file_path = CONFIG_FILE_PATH;
 
         config->priv =
                 G_TYPE_INSTANCE_GET_PRIVATE (config,
@@ -242,7 +247,7 @@
                                             GClueConfigPrivate);
         config->priv->key_file = g_key_file_new ();
         g_key_file_load_from_file (config->priv->key_file,
-                                   CONFIG_FILE_PATH,
+                                   config_file_path,
                                    0,
                                    &error);
         if (error != NULL) {
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<tr><td><span title='2018-11-27 19:58:01 +0200'>2018-11-27</span></td><td><a href='/guix/commit/gnu/packages/patches/x265-arm-flags.patch?id=8e59c5febd2dad171fe90caf04d8b3eb31ca3b31'>gnu: x265: Fix building on armhf-linux.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/video.scm (x265)[patches]: Add patch.
[arguments]: Add a configure-flag to disable assembly. Adjust a custom
phase to recognize armv8 as 32-bit arm when masquerading as armhf-linux.
</span></span></td><td>Efraim Flashner</td></tr>