TOYAMA Shin-ichi noticed that when building for Win32 under mingw/msys,
an #include of "librsvg-cairo.h" was also necessary.
He also bumped the version # in win32/resources.rc
(and I put his credit in there).
I updated docs/RELEASE.txt to mention that .rc file also needing
updated when preparing a new release.
I forgot to make sure macos/Info.plist had the latest version # and
release date, before tagging and releasing source code. Adding a checklist
of places to double-check for properly-updated version #s and/or release dates.