#2 Patch to fix implicit declaration warning/error

[Thierry Moisan]

When compiling gnuski on macOS sonoma, the following error is raised due to an implicit declaration:

  gcc -O2 -o gnuski main.c objects.c -lncurses
  main.c:45:3: error: call to undeclared function 'setupColors'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    setupColors ();
    ^

This patches fixes this issue.