extra/sensors-applet: add patch

extra/sensors-applet/include-unistd.h.patch

@@ -0,0 +1,18 @@
+Description: include <unistd.h> in mbmon-plugin.c
+Author: Dmitry Shachnev <mitya57@debian.org>
+Forwarded: no
+Last-Update: 2024-03-23
+
+--- a/plugins/mbmon/mbmon-plugin.c
++++ b/plugins/mbmon/mbmon-plugin.c
+@@ -36,6 +36,10 @@
+ #include <arpa/inet.h>
+ #endif
+ 
++#ifdef HAVE_UNISTD_H
++#include <unistd.h>
++#endif
++
+ #include "mbmon-plugin.h"
+ 
+ const gchar *plugin_name = "mbmon";