Makefile: Update `AR` command to include `ARFLAGS` #963

Job	Run time
build_windows_msys2 (clang64)	2m 51s
build_windows_msvc (x86)	53s
build_macos	56s
build_windows_msys2 (ucrt64)	4m 3s
build_windows_msvc (x64)	45s
build_windows_msys2 (mingw64)	4m 4s
build (ubuntu-24.04, gcc, protobuf-c, no-valgrind)	53s
build (ubuntu-24.04, gcc, protobuf-cpp, no-valgrind)	3m 53s
build (ubuntu-24.04, clang, protobuf-c, no-valgrind)	50s
build_windows_msys2 (mingw32)	3m 38s
build (ubuntu-24.04, clang, protobuf-c, valgrind)	4m 5s
build (ubuntu-24.04, gcc, protobuf-c, valgrind)	3m 58s
build (ubuntu-24.04, gcc, protobuf-cpp, valgrind)	35m 42s
build (ubuntu-24.04, clang, protobuf-cpp, no-valgrind)	3m 39s
	1h 10m 10s

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