gpujpegtool: no opt arg for shortopt 'i' and 'g'

It is questionable whether even the long opt requires the argument
(those are flags) but definitely it is very impractical in short version
(eg. `-iNg` is not equivalent to `-i -N -g` but to --interleaved=Ng).

Author: MartinPulec

src/main.c

@@ -300,7 +300,7 @@ main(int argc, char *argv[])
     int ch = '\0';
     int optindex = 0;
     char* pos = 0;
-    while ( (ch = getopt_long(argc, argv, "CLRahvD:s:f:c:q:r:g::i::edn:oI:NS::V", longopts, &optindex)) != -1 ) {
+    while ( (ch = getopt_long(argc, argv, "CLRahvD:s:f:c:q:r:giedn:oI:NS::V", longopts, &optindex)) != -1 ) {
         switch (ch) {
         case 'a':
             opts.keep_alpha = true;