declare constant function parameters const (as well as constant function return values)

clients/lcdproc/iface.c

@@ -67,7 +67,7 @@ static struct option const long_options[] =
 static int
 iface_process_configfile()
 {
-	char *unit;
+	const char *unit;
 
 	debug( RPT_DEBUG, "%s()", __FUNCTION__ );
 

clients/lcdproc/machine_Linux.c

@@ -15,6 +15,17 @@
 #include <sys/statvfs.h>
 #include <errno.h>
 
+#if TIME_WITH_SYS_TIME
+# include <sys/time.h>
+# include <time.h>
+#else
+# if HAVE_SYS_TIME_H
+#  include <sys/time.h>
+# else
+#  include <time.h>
+# endif
+#endif
+
 #ifdef USE_GETLOADAVG
 # include <sys/loadavg.h>
 #endif

clients/lcdproc/main.c

@@ -330,7 +330,7 @@ static int
 process_configfile(char *configfile)
 {
 	int k;
-	char *tmp;
+	const char *tmp;
 
 	debug(RPT_DEBUG, "%s(%s)", __FUNCTION__, (configfile) ? configfile : "<null>");