Merge tag '1.5.3'

Tag 1.5.3 release

* tag '1.5.3': (29 commits)
  Fix whitespace errors
  jpeg_crop_scanlines: Handle gray images w/ samp!=1
  Fix lib state when skipping to end of 1-scan image
  Travis: Work around xcode7.3 image bug
  TJExample: Fix array index OOB w/ 4:1:1 JPEG input
  Code formatting tweaks
  Uniquify tjbenchtest log file names based on args
  TJExample.java: Don't ignore mistyped args
  Doc tweak: TJFLAG_ACCURATEDCT is the first flag
  tjbench.exe: Fix decompression access violation
  ChangeLog.md: buglet
  Build: Fix `make dist`
  Further partial image decompression fixes
  TJBench/TJUnitTest: Don't ignore mistyped args
  TurboJPEG C: Code formatting tweaks
  djpeg -crop: Exit gracefully with non-PPM formats
  Prevent "unmappable character" error in Java build
  Fix PowerPC 32-bit RPM build
  Fix 32-bit RPM build w/ newer RHEL/Fedora releases
  Packaging: Use parallel make when rebuilding SRPM
  ...

cdjpeg.h

@@ -3,8 +3,8 @@
  *
  * This file was part of the Independent JPEG Group's software:
  * Copyright (C) 1994-1997, Thomas G. Lane.
- * It was modified by The libjpeg-turbo Project to include only code relevant
- * to libjpeg-turbo.
+ * libjpeg-turbo Modifications:
+ * Copyright (C) 2017, D. R. Commander.
  * mozjpeg Modifications:
  * Copyright (C) 2014, Mozilla Corporation.
  * For conditions of distribution and use, see the accompanying README.ijg file.
@@ -63,6 +63,14 @@ struct djpeg_dest_struct {
                           JDIMENSION rows_supplied);
   /* Finish up at the end of the image. */
   void (*finish_output) (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo);
+  /* Re-calculate buffer dimensions based on output dimensions (for use with
+     partial image decompression.)  If this is NULL, then the output format
+     does not support partial image decompression (BMP and RLE, in particular,
+     cannot support partial decompression because they use an inversion buffer
+     to write the image in bottom-up order.) */
+  void (*calc_buffer_dimensions) (j_decompress_ptr cinfo,
+                                  djpeg_dest_ptr dinfo);
+
 
   /* Target file spec; filled in by djpeg.c after object is created. */
   FILE *output_file;