Ports/ncurses: Disable mixed-case directory names when building on macOS

Since macOS's filesystem is case-insensitive, its `tic` only generates
terminfo directory names that are hex numbers instead of letters, such
as 78/xterm instead of x/xterm. However, the configure script still
enables the mixed-case directory name feature by default. As a result,
ncurses will fail when trying to find terminfo entries like x/xterm if
they are generated on macOS.

It seems like there is no way to change the behavior of `tic` to create
alphabetical directories, so we can only disable this option explicitly.

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