http://bugs.winehq.org/show_bug.cgi?id=19799
--- Comment #6 from Dan Kegel dank@kegel.com 2010-01-15 18:31:28 --- You can bypass that second problem by replacing
cscript //nologo //e:jscript "%~dp0unzip.js" "%~dp0svn.zip" "%WIN_TOOLS_ROOT_DIR%" with c:\cygwin\bin\unzip svn_bin.zip -d ../..
The next problem in Chromium's build env scripts is then bug 21382.