luci-mod-status: realtime graph - find suffixed libiwinfo.so

Change the libiwinfo filename handling to match the current
version suffixed .so file.

Copy solution from bc121a5a4

Fixes #4721

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

modules/luci-mod-status/src/luci-bwc.c

@@ -253,7 +253,21 @@ static void umap_file(struct file_map *m)
 
 static void * iw_open(void)
 {
-	return dlopen("/usr/lib/libiwinfo.so", RTLD_LAZY);
+	void *iwlib = NULL;
+	glob_t paths;
+	int i;
+
+	if (glob("/usr/lib/libiwinfo.so*", 0, NULL, &paths) != 0)
+		return NULL;
+
+	for (i = 0; i < paths.gl_pathc && !iwlib; i++)
+		iwlib = dlopen(paths.gl_pathv[i], RTLD_LAZY | RTLD_LOCAL);
+
+	globfree(&paths);
+
+	if (!iwlib)
+		return NULL;
+	return iwlib;
 }
 
 static int iw_update(