meson.build was already passing --rebuild-types option but not
Makefile.am. Copy the IGNORE_HFILES list from meson.build because it was
outdated in Makefile.am and it's causing build issues when using the
generated gio.types file because it would contain win32 types when
building on linux.
This is a bit awkward. A more elegant solution would have
ignored *all* headers and then *un-ignored* some of them
if some conditions were met.
Sadly, we cannot really ignore all headers and then "unignore"
them: that's not how arrays in Meson work.
https://bugzilla.gnome.org/show_bug.cgi?id=794557
By default, only build man pages and gtk-doc if the build-deps were
found. To force-enable, pass -Dwith-docs=yes and -Dwith-man=yes.
Also use a foreach loop for man pages instead of listing them all
manually
