Update appveyor.yml

The most recent version of the mingw64* is incompatible with the pre-installed version of cygwin. You must either update cygwin or download an old version of mingw64*.

'godi_add godi-zip' should work as intended.

appveyor.yml

@@ -25,7 +25,7 @@ install:
     - cinst 7zip.commandline -y
     # Install ocaml using wodi
     - appveyor DownloadFile "http://cygwin.com/setup-%CYG_ARCH%.exe" -FileName "%CYG_ROOT%\setup.exe"
-    - '%CYG_ROOT%/setup.exe -q -R "%CYG_ROOT%" -P dos2unix -P diffutils -P cpio -P make -P patch -P mingw64-%MINGW_ARCH%-gcc-core -P mingw64-%MINGW_ARCH%-gcc-g++ > log.txt || type log.txt'
+    - '%CYG_ROOT%/setup.exe -g -q -R "%CYG_ROOT%" -P dos2unix -P diffutils -P cpio -P make -P patch -P mingw64-%MINGW_ARCH%-gcc-core -P mingw64-%MINGW_ARCH%-gcc-g++ > log.txt || type log.txt'
     - '%CYG_ROOT%/bin/bash -lc "cygcheck -dc cygwin" > log.txt || type log.txt'
     # The archive is a dropbox hosted version of https://github.com/fdopen/godi-repo/issues/7#issuecomment-98480339
     - '%CYG_ROOT%/bin/bash -lc "wget -q https://dl.dropboxusercontent.com/u/2661116/wodi/%WODI%.tar.xz -O /tmp/%WODI%.tar.xz" > log.txt || type log.txt'