appveyor: fix ssl dependencies (#6170)

apply a fix to remove ssl libraries installed in windows and reinstall them through pacman. This was making tests fail to run cause of missing dlls

.appveyor.yml

@@ -25,11 +25,15 @@ shallow_clone: true
 clone_depth: 10
 
 init:
+# fix for https://github.com/appveyor/ci/issues/2571
+- del C:\Windows\System32\libssl-*.dll C:\Windows\system32\libcrypto-*.dll
+- del C:\Windows\SysWOW64\libssl-*.dll C:\Windows\SysWOW64\libcrypto-*.dll
 - set MSYS2_PATH=c:\msys64
 - set CHERE_INVOKING=1
 - if "%BUILDER%_%PLATFORM%"=="MSYS2_x86" set MSYSTEM=MINGW32
 - if "%BUILDER%_%PLATFORM%"=="MSYS2_x64" set MSYSTEM=MINGW64
-- '%MSYS2_PATH%\usr\bin\bash -lc "pacman --noconfirm -S --needed unzip rsync"'
+- '%MSYS2_PATH%\usr\bin\bash -lc "pacman --noconfirm --needed -Sy bash pacman pacman-mirrors msys2-runtime msys2-runtime-devel"'
+- '%MSYS2_PATH%\usr\bin\bash -lc "pacman --noconfirm -S --needed unzip rsync libopenssl mingw-w64-i686-openssl"'
 - if "%BUILDER%"=="VS" set PATH=%ProgramFiles(x86)%\Microsoft Visual Studio\2017\Community\MSBuild\15.0\Bin;%PATH%
 
 # - IF "%BUILDER%"=="VS" set PATH=C:\Program Files (x86)\MSBuild\14.0\Bin;%PATH%