build: Remove */.gitignore files
Since out-of-source-tree builds are now used after switching to meson, we don't need .gitignore files in the source directories to ignore build artifacts.
This fixes build errors when doing a meson build after an autotools
build, because generated files such as gio/xdp-dbus.c won't show up in
a git status
, or be removed by a git clean -f
, and so it won't be
obvious that such files need to be removed for the meson build to
succeed.