Import the latest sjiscorr.c from Vim 8.1.0108

Author: k-takata

src/po/sjiscorr.c

@@ -7,9 +7,7 @@
 #include <string.h>
 
 	int
-main(argc, argv)
-	int	argc;
-	char	**argv;
+main(int argc, char **argv)
 {
 	char buffer[BUFSIZ];
 	char *p;