fix size_t to int cast to comply to openssl signatures

[pbodilis]

This fixes calls to EVP_DecryptUpdate EVP_CIPHER_CTX_ctrl EVP_EncryptUpdate

[pabuhler]

Hi @pbodilis,
Interesting that you closed your old pr just now, last week I had started to create a pr #743, incorporating your changes while adding the warning to ci builds.
Please check it out and see what you think, I merged your latest changes there.

[pbodilis]

@pabuhler the ossl files are the ones of interest to me, and everything looks ok :)

Note I added an extra commit for the clang format