[x-plane] The core xplm and xpwidgets libraries are not copied into <triplet>\lib on Windows.

[jamarr81]

Describe the bug
The core XPLM_64.lib and XPWidgets_64.lib libraries are not copied into <triplet>\lib or <triplet>\debug\lib. This project distributes its own prebuilt static libraries from zip archives. These two files can be found in the Libraries\Win archive subdirectory. The portfile.cmake (or unofficial CMakeLists.txt?) should only need to copy these files into the respective \lib folders.

Environment

• OS: Windows 11
• Compiler: MSVS 2022

To Reproduce
Steps to reproduce the behavior:

1. Add the x-plane dependency.
2. Build x-plane for (Windows) <triplet>.
3. Check <x-install-root>\<triplet>\lib and <x-install-root>\<triplet>\debug\lib

Expected behavior
The core XPLM_64.lib and XPWidgets_64.lib libraries should be copied into <triplet>\lib and <triplet>\debug\lib.

Failure logs
n/a

Additional context
This project includes 2 core libraries: xplm and xpwidgets; and 1 optional (wrapper) library: xpc. The core libraries are prebuilt static libraries. The optional library has to be compiled. This port currently copies the headers for all 3 libraries into the <triplet>\include directory. This port also compiles and copies the optional xpc library into the \lib directories as xplm_cpp.lib. However, it is not copying the more significant core libraries into the \lib directories.