Fix cygwin builds on appveyor
diff --git a/build/appveyor/CYGW-appveyor-build.bat b/build/appveyor/CYGW-appveyor-build.bat
index fbcc84b..7f33287 100644
--- a/build/appveyor/CYGW-appveyor-build.bat
+++ b/build/appveyor/CYGW-appveyor-build.bat
@@ -23,11 +23,13 @@
-G'%GENERATOR%' ^
-DCMAKE_BUILD_TYPE=%CONFIGURATION% ^
-DCMAKE_INSTALL_PREFIX=%INSTDIR% ^
- -DCMAKE_CXX_EXTENSIONS=ON ^
-DCMAKE_CXX_FLAGS="-D_GNU_SOURCE" ^
- -DCMAKE_CXX_STANDARD=11 ^
+ -DWITH_JAVA=OFF ^
-DWITH_PYTHON=OFF
+:: -DCMAKE_CXX_EXTENSIONS=ON ^
+:: -DCMAKE_CXX_STANDARD=11 ^
+
@ECHO ON
%BASH% -lc "mkdir -p %BUILDDIR% && cd %BUILDDIR% && cmake.exe %SRCDIR% %CMAKEARGS% && cmake --build . --config %CONFIGURATION% --target install" || EXIT /B
@ECHO OFF