Fix many "function declaration isn't a prototype" warnings in libc.

I've only fixed code that seems to be written by `us'. There are still
many warnings like this present in resolv/, rpc/, stdtime/ and yp/.

lib/libc/gen/getttyent.c

@@ -55,8 +55,7 @@ static char *skip(char *);
 static char *value(char *);
 
 struct ttyent *
-getttynam(tty)
-	const char *tty;
+getttynam(const char *tty)
 {
 	struct ttyent *t;
 
@@ -71,7 +70,7 @@ getttynam(tty)
 }
 
 struct ttyent *
-getttyent()
+getttyent(void)
 {
 	static struct ttyent tty;
 	static char devpts_name[] = "pts/4294967295";
@@ -178,8 +177,7 @@ getttyent()
  * the next field.
  */
 static char *
-skip(p)
-	char *p;
+skip(char *p)
 {
 	char *t;
 	int c, q;
@@ -212,15 +210,14 @@ skip(p)
 }
 
 static char *
-value(p)
-	char *p;
+value(char *p)
 {
 
 	return ((p = index(p, '=')) ? ++p : NULL);
 }
 
 int
-setttyent()
+setttyent(void)
 {
 	DIR *devpts_dir;
 
@@ -254,7 +251,7 @@ setttyent()
 }
 
 int
-endttyent()
+endttyent(void)
 {
 	int rval;
 
@@ -272,9 +269,7 @@ endttyent()
 }
 
 static int
-isttystat(tty, flag)
-	const char *tty;
-	int flag;
+isttystat(const char *tty, int flag)
 {
 	struct ttyent *t;
 
@@ -283,15 +278,14 @@ isttystat(tty, flag)
 
 
 int
-isdialuptty(tty)
-	const char *tty;
+isdialuptty(const char *tty)
 {
 
 	return isttystat(tty, TTY_DIALUP);
 }
 
-int isnettty(tty)
-	const char *tty;
+int
+isnettty(const char *tty)
 {
 
 	return isttystat(tty, TTY_NETWORK);

lib/libc/gen/nlist.c

@@ -209,8 +209,7 @@ static void elf_sym_to_nlist(struct nlist *, Elf_Sym *, Elf_Shdr *, int);
  * as such its use should be restricted.
  */
 int
-__elf_is_okay__(ehdr)
-	Elf_Ehdr *ehdr;
+__elf_is_okay__(Elf_Ehdr *ehdr)
 {
 	int retval = 0;
 	/*

lib/libc/gen/pause.c

@@ -40,7 +40,7 @@ __FBSDID("$FreeBSD$");
  * Backwards compatible pause.
  */
 int
-__pause()
+__pause(void)
 {
 	return sigpause(sigblock(0L));
 }

lib/libc/gen/raise.c

@@ -40,8 +40,7 @@ __weak_reference(__raise, raise);
 __weak_reference(__raise, _raise);
 
 int
-__raise(s)
-	int s;
+__raise(int s)
 {
 	return(kill(getpid(), s));
 }

lib/libc/gen/sleep.c

@@ -41,8 +41,7 @@ __FBSDID("$FreeBSD$");
 #include "un-namespace.h"
 
 unsigned int
-__sleep(seconds)
-	unsigned int seconds;
+__sleep(unsigned int seconds)
 {
 	struct timespec time_to_sleep;
 	struct timespec time_remaining;

lib/libc/gen/timezone.c

@@ -40,7 +40,7 @@ __FBSDID("$FreeBSD$");
 #include <string.h>
 #define TZ_MAX_CHARS 255
 
-char *_tztab();
+char *_tztab(int, int);
 
 /*
  * timezone --
@@ -53,9 +53,7 @@ char *_tztab();
 static char	czone[TZ_MAX_CHARS];		/* space for zone name */
 
 char *
-timezone(zone, dst)
-	int	zone,
-		dst;
+timezone(int zone, int dst)
 {
 	char	*beg,
 			*end;
@@ -106,9 +104,7 @@ static struct zone {
  *	STANDARD LIBRARY.
  */
 char *
-_tztab(zone,dst)
-	int	zone;
-	int	dst;
+_tztab(int zone, int dst)
 {
 	struct zone	*zp;
 	char	sign;

lib/libc/gen/usleep.c

@@ -39,8 +39,7 @@ __FBSDID("$FreeBSD$");
 #include "un-namespace.h"
 
 int
-__usleep(useconds)
-	useconds_t useconds;
+__usleep(useconds_t useconds)
 {
 	struct timespec time_to_sleep;
 

lib/libc/gmon/gmon.c

@@ -132,7 +132,7 @@ monstartup(lowpc, highpc)
 }
 
 void
-_mcleanup()
+_mcleanup(void)
 {
 	int fd;
 	int fromindex;

lib/libc/stdio/findfp.c

@@ -168,7 +168,7 @@ __warn_references(f_prealloc,
 	"warning: this program uses f_prealloc(), which is not recommended.");
 
 void
-f_prealloc()
+f_prealloc(void)
 {
 	struct glue *g;
 	int n;

lib/libc/stdio/funopen.c

@@ -42,11 +42,11 @@ __FBSDID("$FreeBSD$");
 #include "local.h"
 
 FILE *
-funopen(cookie, readfn, writefn, seekfn, closefn)
-	const void *cookie;
-	int (*readfn)(), (*writefn)();
-	fpos_t (*seekfn)(void *cookie, fpos_t off, int whence);
-	int (*closefn)();
+funopen(const void *cookie,
+	int (*readfn)(void *, char *, int),
+	int (*writefn)(void *, const char *, int),
+	fpos_t (*seekfn)(void *, fpos_t, int),
+	int (*closefn)(void *))
 {
 	FILE *fp;
 	int flags;

lib/libc/stdlib/system.c

@@ -46,8 +46,7 @@ __FBSDID("$FreeBSD$");
 #include "libc_private.h"
 
 int
-__system(command)
-	const char *command;
+__system(const char *command)
 {
 	pid_t pid, savedpid;
 	int pstat;

lib/libc/sys/__error.c

@@ -39,7 +39,7 @@ extern int errno;
 __weak_reference(__error_unthreaded, __error);
 
 int *
-__error_unthreaded()
+__error_unthreaded(void)
 {
 	return(&errno);
 }