* harbour/external/zlib/zutil.h
* harbour/external/zlib/gzguts.h
* disable vsnprintf() in DOS builds only for DJGPP 2.03 or earlier
! reenabled #include <io.h> in DOS builds - it was disabled by our
local modifications
TODO: regenerate .diff file
* harbour/contrib/hbssl/hbssl.hbc
* moved 'skip={dos}' after 'incpaths=.' as workaround for
broken DOS build process at hbtipssl