Issues building QtOpcua with mbedtls encryption enabled on Windows

While trying to build the QtOpcUa plugin for Windows I have found a couple of issues:

1. mbedtls auto detection seems to fail

The only way that I found in order to get qmake finding that mbedtls was available on my system was adding mbedtls include and libs directories in the qmodule.pri file. I suppose that is not the right approach but I tried and failed to get the same result in a couple of ways:

• installing mbedtls using VCPKG and setting ??"CMAKE_TOOLCHAIN_FILE:STRING=<vcpkg root folder>/scripts/buildsystems/vcpkg.cmake" ??on "Qt Creator->Options->Kits-><kit>->CMake Configuration" 
• compiling mbedtls using Cmake and using "export(PACKAGE mbedtls)" to export the package to the package-registry

Am I missing something or is it editing the qmodule.pri the right solution?

2. missing library import in  open62541.pri

To be able to compile I had to add the following lines

    win32: qtConfig(mbedtls): {

    LIBS += -ladvapi32

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Indeed it seems mbedtls uses CryptAcquireContextA() and others from Advapi32

3. missing include path for OpenSSL

to prevent errors due to the includes in openssl_symbols_p.h

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