[libpng16] Imported from libpng-1.6.20rc01.tar

contrib/gregbook/rpng2-win.c

@@ -33,7 +33,7 @@
     - 2.02:  fixed improper display of usage screen on PNG error(s); fixed
               unexpected-EOF and file-read-error cases
     - 2.03:  removed runtime MMX-enabling/disabling and obsolete -mmx* options
-    - 2.04:  
+    - 2.04:
              (GR-P)
 
   ---------------------------------------------------------------------------

contrib/gregbook/rpng2-x.c

@@ -496,12 +496,12 @@ int main(int argc, char **argv)
           "\t\t  transparent images; overrides -bgcolor\n",
           num_bgpat-1);
 #ifdef FEATURE_LOOP
-        fprintf(stderr, 
+        fprintf(stderr,
           "    -loop\tloops through background images after initial display\n"
           "\t\t  is complete (depends on -bgpat)\n"
           "    sec \tseconds to display each background image (default = 2)\n");
 #endif
-        fprintf(stderr, 
+        fprintf(stderr,
           "    dur \tduration in microseconds to wait after displaying each\n"
           "\t\t  row (for demo purposes)\n"
           "    -timing\tenables delay for every block read, to simulate modem\n"