* [minizip] Update CMakeLists.txt
If the BZip2 package has not been found, ensure that the library does
not assume it is. This would stop any build on targets where bzip2 is
not installed. This can either be the bzip2 package provided by vcpkg
or locally on the system.
Feature:
- Allow optionally to enable bzip2 supprt
* [minizip] Make bzip2 truly optional
Also catch dependency in the corresponding cmake files
