Remove handrolled strcmp()'s

Favor readability over bare-metal.

uuencode.c

@@ -2,6 +2,7 @@
 #include <sys/stat.h>
 
 #include <stdio.h>
+#include <string.h>
 
 #include "util.h"
 
@@ -114,7 +115,7 @@ main(int argc, char *argv[])
 	if (!argc || argc > 2)
 		usage();
 
-	if (argc == 1 || (argv[0][0] == '-' && !argv[0][1])) {
+	if (argc == 1 || !strcmp(argv[0], "-")) {
 		if (mflag)
 			uuencodeb64(stdin, argv[0], "<stdin>");
 		else