Add some more warning flags, and fix these warnings.

git-svn-id: http://lm-sensors.org/svn/lm-sensors/branches/lm-sensors-3.0.0@4545 7894878c-1315-0410-8ee3-d5d059ff63e0

lib/proc.c

@@ -25,6 +25,7 @@
 #include "data.h"
 #include "error.h"
 #include "access.h"
+#include "proc.h"
 
 /* This reads a feature from a sysfs file.
    Sysfs uses a one-value-per file system...