gui: lodepng: Avoid missing prototypes warning
- move prototypes to header file
- remove some unused functions
- make locally used functions static.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
1 parent 6621b89 commit 90cc8c5e02c0585698f144604048b5b280907777
@Sascha Hauer Sascha Hauer authored on 9 Nov 2018
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lib/gui/lodepng.c
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lib/gui/lodepng.h