Merge commit 'c454dfcf'

* commit 'c454dfcf':
  Use ISO C printf conversion specifiers where appropriate

This commit is a noop, an equivalent patch is currently under review on
the mailing-list: http://ffmpeg.org/pipermail/ffmpeg-devel/2017-March/209239.htmlMerged-by: Clément Bœsch <u@pkh.me>

doc/libav-merge.txt

@@ -98,6 +98,7 @@ Stuff that didn't reach the codebase:
 - Removal of the custom atomic API (5cc0057f49, see http://ffmpeg.org/pipermail/ffmpeg-devel/2017-March/209003.html)
 - Use the new bitstream filter for extracting extradata (see 8e2ea69135 and 096a8effa3)
 - ADD_RES_MMX_4_8 in libavcodec/x86/hevc_add_res.asm probably needs updating (see 589880710)
+- ISO printf warnings raised by DJGPP (c454dfcff9, currently under review: http://ffmpeg.org/pipermail/ffmpeg-devel/2017-March/209239.html)
 
 Collateral damage that needs work locally:
 ------------------------------------------