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) {
ight'></td></tr></table>
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<tr><td><span title='2023-11-07 18:07:08 +0200'>2023-11-07</span></td><td><a href='/guix/commit/etc/completion/fish?id=e0f28301f07e55b7acc48fca2e13b588471d0ede'>fish completion: Fix typos.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2021-04-20 12:13:16 +0200'>2021-04-20</span></td><td><a href='/guix/commit/etc/completion/fish?id=d95168321f4a9bf6857b598da0a183b45a868d54'>import: Remove Nix importer.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-02-17 10:52:28 +0100'>2021-02-17</span></td><td><a href='/guix/commit/etc/completion/fish?id=ee2a5da80a9bda25542c00a7a35a9ddddcbd58af'>scripts: system: Remove 'vm-image' command.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-05-13 09:30:26 +0300'>2020-05-13</span></td><td><a href='/guix/commit/etc/completion/fish?id=3c986a7dc268756c097212de958f046b29b76c1b'>mailmap: Update entries for Nikita.</a><span class='msg-avail'>...</span></td><td>nikita</td></tr>
<tr><td><span title='2019-11-26 00:16:36 +0100'>2019-11-26</span></td><td><a href='/guix/commit/etc/completion/fish?id=dc209d5a5ddba4320c9a4f893d6df4b70f3685a0'>guix build, daemon: Rename "--no-build-hook" to "--no-offload".</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>