Update build flags to remove unused warnings

This change updates the CMAKE_CXX_FLAGS in CMakeLists.txt-macos to
remove the -Wunused flag. This flag was causing unused warnings to be
raised during the build process, potentially leading to false positives
and unnecessary noise. By removing the flag, the build process becomes
cleaner and easier to interpret.

cpp/CMakeLists.txt-macos

@@ -282,7 +282,7 @@ message(STATUS "Setting up build for AppleClang.")
 target_link_libraries(katago KataGoSwift)
 find_package (Threads REQUIRED)
 target_link_libraries(katago Threads::Threads)
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -O2 -pedantic -Wall -Wextra -Wno-sign-compare -Wcast-align -Wcast-qual -Wctor-dtor-privacy -Wdisabled-optimization -Wformat=2 -Wmissing-declarations -Wmissing-include-dirs -Woverloaded-virtual -Wredundant-decls -Wshadow -Wstrict-overflow=1 -Wswitch-default -Wfloat-conversion -Wunused")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -O2 -Wall -Wextra -Wno-sign-compare -Wcast-align -Wctor-dtor-privacy -Wdisabled-optimization -Wformat=2 -Wmissing-declarations -Wmissing-include-dirs -Woverloaded-virtual -Wredundant-decls -Wshadow -Wstrict-overflow=1 -Wswitch-default -Wfloat-conversion -Wunused")
 message(STATUS "Enabling AppleClang-specific build options.")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wnull-dereference -Wdangling-else")