Don't exclude non-MSW specific files any longer from the generated
installer for MSW. The space savings are hardly worth the effort:
originally 46.9 MiB (133 MiB installed) and with all files included 48 MiB
(142 MiB installed).
Also by having all files in the installer more exotic builds such as wxGTK
for MSW are available.
(cherry picked from commit 9a9a1199d4)
c293c645d7