`target_link_system_directories` dosen't support generator expressions that have semicolons

[FeignClaims]

I used Ninja Multi-Config as the generator and linked a library that has multiple header directories (SDL2 using conan 2.0). That is,

lib="SDL2::SDL2";
lib_include_dirs="
$<$<CONFIG:Debug>:/Users/feignclaims/.conan2/p/sdl5ab8a88787389/p/include;/Users/feignclaims/.conan2/p/sdl5ab8a88787389/p/include/SDL2>;
$<$<CONFIG:Release>:/Users/feignclaims/.conan2/p/sdl88e5402c853dd/p/include;/Users/feignclaims/.conan2/p/sdl88e5402c853dd/p/include/SDL2>
"

Notice semicolons inside the generator expressions. When calling target_include_directories inside target_include_system_directories, the expression is split to the following during the loop, which is apparently not the expected behaviour.

"$<$<CONFIG:Debug>:/Users/feignclaims/.conan2/p/sdl5ab8a88787389/p/include"
"/Users/feignclaims/.conan2/p/sdl5ab8a88787389/p/include/SDL2>"
"$<$<CONFIG:Release>:/Users/feignclaims/.conan2/p/sdl88e5402c853dd/p/include"
"/Users/feignclaims/.conan2/p/sdl88e5402c853dd/p/include/SDL2>"

The solution might be to use a regex to split these expression. I haven't figured it out for now.

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