build-openssl.bat dont have option for custom path for VS and perl

[patelvivekv1993]

I did this

I was trying to use the .bat file to build openssl but it was saying visual studio not found even if it was installed. On inspecting i found visual studio was installed on a different path in my PC. Similarly for the perl library no custom path can be set if user is having portable library.

I expected the following

.bat file should be able to provide multiple options to the user.

curl/libcurl version

v1.3
[curl -V output]

operating system

Windows

[patelvivekv1993]

I would like to contribute and make the .bat file more generalized. Let me know if this issue is accepted.

[bagder]

Please go ahead, I'm sure it'll be appreciated!

[bagder]

See also #2189