Support the PURPLE_PLUGIN_PATH environment variable.  This patch is based on
one from Nixpkgs, but properly handles the case where that variable is unset.

--- pidgin-2.10.11/libpurple/plugin.c.orig	2014-11-23 11:41:25.000000000 -0500
+++ pidgin-2.10.11/libpurple/plugin.c	2015-08-04 14:31:02.257366144 -0400
@@ -1178,8 +1178,19 @@
 void
 purple_plugins_init(void) {
 	void *handle = purple_plugins_get_handle();
+	const gchar *purple_plugin_path;
 
 	purple_plugins_add_search_path(LIBDIR);
+	purple_plugin_path = g_getenv("PURPLE_PLUGIN_PATH");
+	if (purple_plugin_path && *purple_plugin_path) {
+		gchar **paths = g_strsplit(purple_plugin_path, ":", -1);
+		if (paths) {
+			gchar **p;
+			for (p = paths; *p; ++p)
+				if (**p) purple_plugins_add_search_path(*p);
+		}
+		g_strfreev(paths);
+	}
 
 	purple_signal_register(handle, "plugin-load",
 						 purple_marshal_VOID__POINTER,
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<tr><td><span title='2024-09-09 17:17:55 +0200'>2024-09-09</span></td><td><a href='/guix/commit/gnu/system/locale.scm?id=9d17cda3d915e1226494a1983ef95a3c600acf9d'>system: locale: ‘glibc-supported-locales’ uses zstd instead of xz.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a followup to c9666c120b8e40321d6044f572533e160c1e0351.

Fixes &lt;https://issues.guix.gnu.org/73065&gt;.

* gnu/system/locale.scm (glibc-supported-locales): Change XZ to ZSTD.

Change-Id: Ie3cb5d50648a0698ce5246591fb405e4eb690af5
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2024-08-31 10:45:04 +0200'>2024-08-31</span></td><td><a href='/guix/commit/gnu/system/locale.scm?id=ede5ae459b42b85c3f0961903b8a8c2b79ca2795'>gnu: %default-locale-libcs: Add glibc-2.35 and generalize for Hurd.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/locale.scm (%default-locale-libcs): Stop checking for Hurd, since
we have the same libc now.  Also add glibc-2.35 while the transition happens.

Change-Id: I1f4980d18184580f3a42a86ca244c8015df15269
</span></span></td><td>Josselin Poiret</td></tr>
<tr><td><span title='2024-04-29 22:52:08 +0200'>2024-04-29</span></td><td><a href='/guix/commit/gnu/system/locale.scm?id=6228a2b8bac30b502e69cfd372554103492ff96a'>locale: Shrink ‘%default-locale-definitions’ from 34 to 10 locales.</a><span class='msg-avail'>...<span class='msg-tooltip'>This reduces the default set of locales from 92 MiB to 28 MiB.

* gnu/system/locale.scm (%default-locale-definitions): Reduce to 10
locales.

Change-Id: I3c092604301d69db591957bcfd62a062c3ac5ab0
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2024-04-29 22:44:06 +0200'>2024-04-29</span></td><td><a href='/guix/commit/gnu/system/locale.scm?id=0575933ac24ad6b9a101dd762405b0cc002e9a53'>system: Remove ‘glibc-2.33’ from ‘%default-locale-libcs’.</a><span class='msg-avail'>...<span class='msg-tooltip'>The transition from glibc 2.33 to 2.35 was done in
c919bfefd98bf2e29549539b4e28e6dc2a8a6f32 (one year ago), so we can
assume that the backward-compatible locales are no longer needed by
default.

This removes 92 MiB from the system closure.

* gnu/system/locale.scm (%default-locale-libcs): Remove GLIBC-2.33.

Change-Id: I85948bbe6b2d424f9f158eeafdb5543688c66c6b
</span></span></td><td>Ludovic Courtès</td></tr>