[patch #6492] More robust detection of libncurses

[John Darrington]

Follow-up Comment #2, patch #6492 (project pspp):

>  I don't see a good reason to rename HAVE_NCURSES to LIBNCURSES_USABLE.

I did this because HAVE_NCURSES is automatically set by AC_CHECK_LIB(ncurses)
which may be called indirectly by other macros.  When HAVE_NCURSES is
non-zero, this merely asserts that the library is present on the system.  It
doesn't mean that the header file(s) are present.

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