Remove code for the obsolete RLE image format

libjpeg-turbo never included that code, because it requires an external
library (the Utah Raster Toolkit.)  The RLE image format was supplanted
by GIF in the late 1980s, so it is rarely seen these days.  (It had a
lousy Weissman score, anyhow.)

djpeg.c

@@ -71,7 +71,6 @@ typedef enum {
   FMT_GIF,                      /* GIF format */
   FMT_OS2,                      /* BMP format (OS/2 flavor) */
   FMT_PPM,                      /* PPM/PGM (PBMPLUS formats) */
-  FMT_RLE,                      /* RLE format */
   FMT_TARGA,                    /* Targa format */
   FMT_TIFF                      /* TIFF format */
 } IMAGE_FORMATS;
@@ -141,10 +140,6 @@ usage(void)
   fprintf(stderr, "  -pnm           Select PBMPLUS (PPM/PGM) output format%s\n",
           (DEFAULT_FMT == FMT_PPM ? " (default)" : ""));
 #endif
-#ifdef RLE_SUPPORTED
-  fprintf(stderr, "  -rle           Select Utah RLE output format%s\n",
-          (DEFAULT_FMT == FMT_RLE ? " (default)" : ""));
-#endif
 #ifdef TARGA_SUPPORTED
   fprintf(stderr, "  -targa         Select Targa output format%s\n",
           (DEFAULT_FMT == FMT_TARGA ? " (default)" : ""));
@@ -400,10 +395,6 @@ parse_switches(j_decompress_ptr cinfo, int argc, char **argv,
     } else if (keymatch(arg, "report", 2)) {
       report = TRUE;
 
-    } else if (keymatch(arg, "rle", 1)) {
-      /* RLE output format. */
-      requested_fmt = FMT_RLE;
-
     } else if (keymatch(arg, "scale", 2)) {
       /* Scale the output image by a fraction M/N. */
       if (++argn >= argc)       /* advance to next argument */
@@ -695,11 +686,6 @@ main(int argc, char **argv)
     dest_mgr = jinit_write_ppm(&cinfo);
     break;
 #endif
-#ifdef RLE_SUPPORTED
-  case FMT_RLE:
-    dest_mgr = jinit_write_rle(&cinfo);
-    break;
-#endif
 #ifdef TARGA_SUPPORTED
   case FMT_TARGA:
     dest_mgr = jinit_write_targa(&cinfo);