Build with OpenSSL 1.1 and sync SONAME with upstream
Closes: #858398
Due to API change in OpenSSL that are exposed by libcurl, we need to rename the libcurl3 package (similar to what was done for the GCC 5 C++ ABI transition).
Due to the fact that the previous transition from libcurl3 -> libcurl4 was partially reverted (lib packages are still called libcurl3* and we ship "libcurl*.so.3" symlinks to "libcurl*.so.4"), take the opportunity to finish the transition to "libcurl.so.4":
- Rename all libcurl packages to libcurl4*
- Add Conflicts/Replaces for the old packages
- Update symbols files
- Remove old libcurl*.so.3 symlinks