Fix find_link_library in the event the linker flag check fails.

[WildCard65]

This small pull request fixes the issue #1113 by doing 2 things:

1. Actually pass the library name being searched for to find_library
2. Use unique variables when invoking find_library in order to avoid any shenanigans older CMake versions may pull (unlikely, but better to be safe than sorry).

[Copilot]

Pull Request Overview

This PR fixes a bug in the find_link_library CMake function where the library name parameter was not being properly passed to find_library, and improves variable naming to avoid potential conflicts across multiple invocations.

• Corrects the find_library call to actually use the libname parameter instead of treating it as a literal string
• Updates variable names to be unique per library to prevent potential CMake variable collision issues