Conditionally include vcpkg port file generation

[abeltrano]

Type

• Bug fix
• Feature addition
• Feature update
• Documentation
• Build Infrastructure

Side Effects

• Breaking change
• Non-functional change

Goals

• Avoid calling external processes when building the project as a vcpkg port.

Technical Details

• Conditionally include vcpkg packaging directory in CMake execution by restoring the previously removed NETREMOTE_BUILD_FOR_VCPKG_PORT variable.

Test Results

• Built with and without NETREMOTE_VCPKG_BUILD_FOR_PORT defined and verified the port file was and was not generated, respectively.

Reviewer Focus

• None

Future Work

• None

Checklist

• Build target all compiles cleanly.
• clang-format and clang-tidy deltas produced no new output.
• Newly added functions include doxygen-style comment block.