update appveyor file to new directory structure

Author: Benjamin Sergeant

appveyor.yml

@@ -9,13 +9,13 @@ install:
 - cmd: call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvars64.bat"
 - vcpkg install zlib:x64-windows
 - vcpkg install mbedtls:x64-windows
-- cd test
 - mkdir build
 - cd build
-- cmake -DCMAKE_TOOLCHAIN_FILE=c:/tools/vcpkg/scripts/buildsystems/vcpkg.cmake -DUSE_TLS=1 -G"NMake Makefiles" ..
+- cmake -DCMAKE_TOOLCHAIN_FILE=c:/tools/vcpkg/scripts/buildsystems/vcpkg.cmake -DUSE_WS=1 -DUSE_TEST=1 -DUSE_TLS=1 -G"NMake Makefiles" ..
 - nmake
 - cd ..
-- build\ixwebsocket_unittest.exe
+- cd test
+- ..\build\test\ixwebsocket_unittest.exe
 
 cache: c:\tools\vcpkg\installed\