+20151212
+ + improve CF_XOPEN_CURSES macro used in test/configure, to define as
+ needed NCURSES_WIDECHAR for platforms where _XOPEN_SOURCE_EXTENDED
+ does not work. Also modified the test program to ensure that if
+ building with ncurses, that the cchar_t type is checked, since that
+ normally is since 20111030 ifdef'd depending on this test.
+ + improve 20121222 workaround for broken acs, letting Solaris "work"
+ in spite of its m.isconfigured wcwidth which marks all of the line
+ drawing characters as double-width.
+