Remove more C/C++-related stuff

dependencies/fmt/CMakeLists.txt

-message(STATUS "Fetching fmt...")
-
-FetchContent_Declare(fmt
-	GIT_REPOSITORY https://github.com/fmtlib/fmt
-	GIT_TAG 9.1.0
-)
-FetchContent_MakeAvailable(fmt)
-
-add_library(dependency_fmt INTERFACE)
-target_include_directories(dependency_fmt SYSTEM INTERFACE $<TARGET_PROPERTY:fmt-header-only,INTERFACE_INCLUDE_DIRECTORIES>)
-target_link_libraries(dependency_fmt INTERFACE fmt-header-only)