message: appveyor: update libcurl
diff: @@ -35,15 +35,15 @@ before_build:
  - cd C:\dronecode_sdk
  - git submodule update --init --recursive --depth 100
  - cd C:\
  - - appveyor DownloadFile https://curl.haxx.se/download/curl-7.56.1.zip
  - - 7z x -y curl-7.56.1.zip
  + - appveyor DownloadFile https://curl.haxx.se/download/curl-7.64.1.zip
  + - 7z x -y curl-7.64.1.zip
  build: on
  build_script:
  - set CL=/MP
  - call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvars64.bat"
  - - cd curl-7.56.1\winbuild
  + - cd curl-7.64.1\winbuild
  - if "%configuration%"=="Debug" (
  nmake /f Makefile.vc mode=static VC=15 MACHINE=x64 DEBUG=yes
  ) else (
  @@ -54,9 +54,9 @@ 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" -DCMAKE_INSTALL_PREFIX=..\install ..
  + cmake -DWIN_CURL_INCLUDE_DIR:STRING="C:\curl-7.64.1\include" -DWIN_CURL_LIB:STRING="C:\curl-7.64.1\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" -DCMAKE_INSTALL_PREFIX=..\install ..
  + cmake -DWIN_CURL_INCLUDE_DIR:STRING="C:\curl-7.64.1\include" -DWIN_CURL_LIB:STRING="C:\curl-7.64.1\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
  