[Bug 50050] Wine 5.20 build fails on Ubuntu 16.04

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50050

--- Comment #1 from Esme Povirk  ---
[ 1246s] In file included from /usr/include/zlib.h:34:0,
[ 1246s]                  from /usr/include/libpng12/png.h:317,
[ 1246s]                  from dlls/windowscodecs/libpng.c:46:
[ 1246s] /usr/include/x86_64-linux-gnu/zconf.h:377:22: error: expected '=',
',', ';', 'asm' or '__attribute__' before 'Bytef'
[ 1246s]     typedef Byte  FAR Bytef;

Is there something before this line in zconf.h that might explain this?