message: appveyor: install locally into install
  Without this the default is C:\Program Files\ which requires admin
  privileges.
diff: @@ -56,9 +56,9 @@ build_script:
  - md build
  - cd build
  - if "%configuration%"=="Debug" (
  - cmake -DWIN_CURL_INCLUDE_DIR:STRING="C:\curl-7.56.1\include" -DWIN_CURL_LIB:STRING="C:\curl-7.56.1\builds\libcurl-vc15-x64-debug-static-ipv6-sspi-winssl\lib\libcurl_a_debug.lib" -G "Visual Studio 15 2017 Win64" ..
  + cmake -DWIN_CURL_INCLUDE_DIR:STRING="C:\curl-7.56.1\include" -DWIN_CURL_LIB:STRING="C:\curl-7.56.1\builds\libcurl-vc15-x64-debug-static-ipv6-sspi-winssl\lib\libcurl_a_debug.lib" -G "Visual Studio 15 2017 Win64" -DCMAKE_INSTALL_PREFIX=..\install ..
  ) else (
  - cmake -DWIN_CURL_INCLUDE_DIR:STRING="C:\curl-7.56.1\include" -DWIN_CURL_LIB:STRING="C:\curl-7.56.1\builds\libcurl-vc15-x64-release-static-ipv6-sspi-winssl\lib\libcurl_a.lib" -G "Visual Studio 15 2017 Win64" ..
  + cmake -DWIN_CURL_INCLUDE_DIR:STRING="C:\curl-7.56.1\include" -DWIN_CURL_LIB:STRING="C:\curl-7.56.1\builds\libcurl-vc15-x64-release-static-ipv6-sspi-winssl\lib\libcurl_a.lib" -G "Visual Studio 15 2017 Win64" -DCMAKE_INSTALL_PREFIX=..\install ..
  )
  - if "%configuration%"=="Debug" (
  cmake --build . --target install --config Debug
  