[IMPROVEMENT]Update LibPNG to 1.6.35

[MatejMecka]

Please prefix your pull request with one of the following: [FEATURE] [FIX] [IMPROVEMENT].

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Updated LibPNG to 1.6.35 released on Jul 15 2018

[ccextractor-bot]

CCExtractor CI platform finished running the test files on linux. Below is a summary of the test results:

Report Name	Tests Passed
Broken	13/13
DVB	4/7
DVR-MS	2/2
General	27/27
Hauppage	3/3
MP4	3/3
NoCC	10/10
Teletext	21/21
WTV	13/13
XDS	34/34
CEA-708	14/14
DVD	3/3
Options	86/86

It seems that not all tests were passed completely. This is an indication that the output of some files is not as expected (but might be according to you).

Your PR breaks these cases:

• ccextractor -autoprogram -out=srt -latin1 85271be4d2...
• ccextractor -stdout -quiet -nofc -nodvbcolor 79a51f3500...
• ccextractor -stdout -quiet -nofc -nodvbcolor 767b546f96...

Check the result page for more info.

[ccextractor-bot]

CCExtractor CI platform finished running the test files on windows. Below is a summary of the test results:

Report Name	Tests Passed
Broken	12/13
DVB	4/7
DVR-MS	2/2
General	27/27
Hauppage	3/3
MP4	3/3
NoCC	10/10
Teletext	21/21
WTV	13/13
XDS	34/34
CEA-708	14/14
DVD	3/3
Options	85/86

It seems that not all tests were passed completely. This is an indication that the output of some files is not as expected (but might be according to you).

Your PR breaks these cases:

• ccextractor -out=sami -latin1 -autoprogram 5b4e0a6034...
• ccextractor -autoprogram -out=srt -latin1 85271be4d2...
• ccextractor --capfile /repository/Dictionary/MattS_dictionary.txt c83f765c66...
• ccextractor -stdout -quiet -nofc -nodvbcolor 79a51f3500...
• ccextractor -stdout -quiet -nofc -nodvbcolor 767b546f96...

Check the result page for more info.

[dpshelio]

This file contains DOS line endings: \r\n instead of only \n for each line of the file. That's why the commit looks that big.
There's more info in "dealing with line endings" github page.
There are some ways to convert them back using windows, however I would wait from someone of the project to give guidance on how to do it, whether some force commit is needed to don't bloat the history of these files.