- Add ncurses patch 20200308
+ update copyright notices in test-packages.
+ modify tracemunch to guard against errors in its known_p1 table.
+ add several --with-xxx-libname options, to help with pkgsrc (prompted
by discussion with Thomas Klausner).

- Add ncurses patch 20200301
+ modify wbkgd() and wbkgrnd() to avoid storing a null in the
background character, because it may be used in cases where the
corresponding 0x80 is not treated as a null (report by Marc Rechte,
cf: 20181208).

- Add ncurses patch 20200229
+ modify CF_NCURSES_CONFIG to work around xcode's c99 "-W" option,
which conflicts with conventional use for passing linker options.
> fixes for building with Visual Studio C++ and msys2 (patches by
"Maarten Anonymous"):
+ check for pcre2posix.h instead of pcre2-posix.h
+ add case in CF_SHARED_OPTS for msys2 + msvc
+ add fallback definition for STDIN_FILENO in progs.priv.h
+ modify win_driver.c to use _alloca() rather than gcc's variable
length array feature.
+ add NCURSES_IMPEXP to ncurses wrapped-variable declarations
+ remove NCURSES_IMPEXP from class variables in c++/cursslk.h
+ remove fallback prototype for exit() from c++/etip.h.in
+ use configured check for in a couple of places
+ conditionally include winsock.h in ncurses/win32con/gettimeofday.c,
because Visual Studio needs this for the timestruct declaration.
+ adjust syntax in a couple of files using the NCURSES_API symbol.