Fix CMake build of Poco Crypto with custom libcrypto.lib names

Crypto uses #pragma comment(lib) in Crypto.h to link to libcrypto.lib. Some OpenSSL builds on Windows have different names for libcrypto.lib and these are set correctly via CMake but still Crypto.h also links to libcrypto.lib, which cannot be found in these cases.

The same applies for libssl.lib.

We set POCO_NO_AUTOMATIC_LIBS to disable hard-coded linking in Crypto.h.