Fix Windows build process

[vnescape]

When building NtRays for Windows, it tries to link against "idasdk90\lib\x64_win_vc_64\ida.lib.lib" which does not exist. Removing the .lib suffix in CMakeLists fixes the problem.

I have also updated the build instructions to make it easier to build the plugin.

[mrexodia]

This happens because you need to pass an absolute path, now you broke that.

[vnescape]

Can you specify to which paths, relative or absolute, -DIDA_SDK_DIR as well as -DHEXRAYS_SDK_DIR should be set then?

[mrexodia]

I think I saw it wrong when looking at the changes to README initially. I would suggest to make sure both variables are expanded to relative paths before passing them to target_link_libraries

[vnescape]

You probably mean extended to absolute paths, don't you? Perhaps you could describe how you would build the project on windows, giving idasdk90 which contains: bin, dbg, idalib etc.

[mrexodia]

Took me a while, but finally had some time to try building master:

git submodule update --init
cmake -B build -DIDA_SDK_DIR:FILEPATH=c:\IDA90SP1\idasdk90 -DHEXRAYS_SDK_DIR:FILEPATH=c:\IDA90SP1\idasdk90
cmake --build build

I think things could be improved in a few ways:

• Infer HEXRAYS_SDK_DIR if IDA_SDK_DIR/include/hexrays.hpp exists (since 9.0 these were merged)
• Normalize IDA_SDK_DIR (and HEXRAYS_SDK_DIR) to always be an absolute path