Add missing include.

git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@4547 7894878c-1315-0410-8ee3-d5d059ff63e0

lib/proc.c

@@ -30,6 +30,7 @@
 #include "data.h"
 #include "error.h"
 #include "access.h"
+#include "proc.h"
 #include "general.h"
 #include "sysfs.h"