ncurses: Don't create library aliases in an unsafe mannerxry111/ncurses-disallow-abi-mismatch

TL;DR DO NOT REVERT THIS COMMIT BECAUSE IT MAKES A BLFS PACKAGE FTBFS!

The ABI of libncurses and libncursesw (et al) are different so it's
unsafe to use libncursesw as a drop-in of libncurses.  If an application
is built with -D_XOPEN_SOURCES={a number >= 500} or
-D_XOPEN_SOURCES_EXTENDED, it should use libncursesw; otherwise it
should use libncurses.  Otherwise there will be an ABI mismatch and it
may cause segfault etc.

An exception: the terminfo (terminal capability database) support in
libncursesw and libncurses are the same.  Thus the distros providing
both libncursesw and libncurses configure Ncurses --with-termlib so the
terminfo support will be a standalone libtinfo library, instead of being
duplicated in two ncurses libraries.  Create a symlink so the packages
only using terminfo support from ncurses can find the libncursesw
library and use it.

If a BLFS package using libncurses FTBFS after this change, we need to
define -D_XOPEN_SOURCES=600 (as pkg-config --cflags ncursesw outputs),
before hacking it to use libncursesw instead.

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