* Turns out that on SunOS/OmniOS the ncurses port does not ship with
  a ncursesw pkg-config file, but the ncurses file is for a version,
  that does contain widechar support as well.
* Instead of adding yet another recursive PKG_CHECK_MODULES() call,
  we now use the AX_WITH_CURSES() macro, which is probably more robust.
  This should at least fix ./configure on OmniOS.
* It also adds a number of feature C macros, that could be useful to
  check in the future.
* At the moment, we strive to support all X/Open-compatible Curses
  libraries, but both enhanced and color functions are required.
  Therefore plain SVr4 Curses is not supported.
* source: https://www.gnu.org/software/autoconf-archive/ax_with_curses.html

Unfortunately, it does not help with the slowdowns when editing files with very long lines.

This does not change anything functionally.

* I am not entirely sure whether it would be safe to bundle
  api-ms-win-core-synch-l1-2-0.dll or bcryptprimitives.dll,
  so I won't upstream this change yet.
* Should fix GTK/Win32 nightly builds.

* they don't have A_ITALIC
* should fix the nightly builds

* For instance, when using the Solarized color scheme,
  comments will be in italics.
* The underline style could also be supported in color.set,
  but currently it's not required.
* Unfortunately, this does *not* fix the INDIC_PLAIN indicator style for
  underlining, so you still cannot use that eg. for spell checking.
* See https://github.com/orbitalquark/scinterm/issues/22

* There are patches on top of Scintilla as were before
* Scinterm has been switched back to the upstream repository and there are unreleased
  commits - especially for out-of-tree builds.
* Lexilla hasn't been released since my troff lexer was merged.

* You no longer have to copy contrib/scintilla, contrib/scinterm and contrib/lexilla
  manually to the build directory.
* It turns out, that Scintilla/Lexilla was supporting this since 2016.
  Scintilla allows pointing to a source directory (srdir) and Lexilla to a binary directory (DIR_O).
* For Scinterm I opened a pull request in order to add srcdir/basedir variables:
  https://github.com/orbitalquark/scinterm/pull/21
* `make distcheck` is therefore now also fixed.
* The FreeBSD package is now allowed to build out of source.
  I haven't tested it yet.
* See also https://github.com/ScintillaOrg/lexilla/issues/266