+20121222
+ + add *.dSYM directories to clean-rule in ncurses directory makefile,
+ for Mac OS builds.
+ + add a configure check for gcc option -no-cpp-precomp, which is not
+ available in all Mac OS X configurations (report by Andras Salamon,
+ cf: 20011208).
+ + improve 20021221 workaround for broken acs, handling a case where
+ that ACS_xxx character is not in the acsc string but there is a known
+ wide-character which can be used.
+