options for curl link - make it -lws2_32 because on mingw32 cross-compile, linux is case-sensitive.
The GTK builds no longer use cURL. The WinCairo link flags have the desired capitalization. I also double-checked the source archive and can't find any instances of -lWs2_32 anywhere, so I believe this issue has been resolved. Please reopen if you are still seeing this problem.