Added copyright notices

callbacks/example/callback.c

callbacks/libc/include/cgc.h

callbacks/libc/include/malloc.h

callbacks/libc/include/stdint.h

callbacks/libc/include/stdlib.h

callbacks/libc/include/syscall.h

callbacks/libc/include/unistd.h

callbacks/libc/src/malloc.c

callbacks/libc/src/unistd.c

include/zipr_optimizations.h

include/zipr_stats.h

src/memory_space.cpp

src/zipr_options.cpp

src/zipr_stats.cpp

test/MemorySpace.cpp