Rip Out References to `make` in place of regular `cmake`

[jalcine]

Instead of using make directly, we'll have to let cmake drive the builld process. From a quick grep, the only places still using it are:

autoload/cmake/buffer.vim:66:  let &l:makeprg = "make -C " . g:cmake_root_binary_dir . " " . b:cmake_target
autoload/cmake/util.vim:102:  let l:command = 'make -C ' . cmake#util#binary_dir() . ' ' . a:command

[jalcine]

Instead, we'll let the extension system handle this.