vim/vimrc: indenting structure initializers

vim/vimrc: indenting structure initializers

Use the java cinoptions to get better behavior for initializers of
structures when using named member initialization.

Note that these options cause some C code to be indented incorrectly,
for example:

if (func1(arg, arg) ==
    value) {
  do_something();
}

becomes:

if (func1(arg, arg) ==
    value) {
      do_something();
    }