unbreak build:

K&R style main() makes gcc emit a warning about missing prototypes so
switch to ANSI.

usr.bin/uudecode/uudecode.c

@@ -75,9 +75,7 @@ int	decode2(int);
 void	base64_decode(const char *);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	int rval, ch;
 

usr.bin/uuencode/uuencode.c

@@ -72,9 +72,7 @@ int mode;
 char **av;
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	struct stat sb;
 	int base64;