appveyor: Fix broken URL
The commit bumped the OpenSSL
version, but got the URL wrong.
Use uppercase `L` instead of lowercase `l`.
@@ -15,7 +15,7 @@ init:
Invoke-WebRequest $source -OutFile $destination
- $source = "https://slproweb.com/download/Win32OpenSSL-1_0_2l.exe"
+ $source = "https://slproweb.com/download/Win32OpenSSL-1_0_2L.exe"
$destination = "C:\ovs-build-downloads\Win32OpenSSL-1_0_2l.exe"
