renamed all functions implementing features to '__s'.

* sysdeps/linux/*.c: renamed all functions implementing
features to '__s'.

sysdeps/linux/procsignal.c

@@ -29,7 +29,7 @@ static const unsigned long _glibtop_sysdeps_proc_signal =
 /* Provides detailed information about a process. */
 
 void
-glibtop_get_proc_signal__r (glibtop *server, glibtop_proc_signal *buf, pid_t pid)
+glibtop_get_proc_signal__s (glibtop *server, glibtop_proc_signal *buf, pid_t pid)
 {
 	char input [BUFSIZ], *tmp;
 	int nread;