Use fputs instead of fprintf for plain strings

LLVM's Clang warns about this. outieee.c had a real problem.

ndisasm.c

@@ -112,7 +112,7 @@ int main(int argc, char **argv)
                     p++;
                     break;
                 case 'h':
-                    fprintf(stderr, help);
+                    fputs(help, stderr);
                     return 0;
                 case 'r':
                 case 'v':

output/outieee.c

@@ -1152,7 +1152,7 @@ static void ieee_putascii(char *format, ...)
         if ((uint8_t)buffer[i] > 31)
             checksum += buffer[i];
     va_end(ap);
-    fprintf(ofile, buffer);
+    fputs(buffer, ofile);
 }
 
 /*

rdoff/rdflib.c

@@ -166,7 +166,7 @@ int main(int argc, char **argv)
 
     if (argc < 3 || !strncmp(argv[1], "-h", 2)
         || !strncmp(argv[1], "--h", 3)) {
-        printf(usage);
+        fputs(usage, stdout);
         exit(1);
     }