Simon McVittie authored Dec 05, 2018 and Ralf Habacker committed Dec 05, 2018

On Windows, the "out" parameter for the process handle isn't set
unless we specify G_SPAWN_FLAGS_DO_NOT_REAP_CHILD. That means we
can't terminate it, and the child process is leaked. When running the
test individually, the leaked process is harmless apart from its
resource cost, but when running under CTest, it holds a file descriptor
open (or something) which causes CTest to not exit.

If we *do* specify G_SPAWN_FLAGS_DO_NOT_REAP_CHILD, we become
responsible for "reaping" the child process by waiting for its exit
status, which is an OS-specific action.

Signed-off-by: Simon McVittie <smcv@collabora.com>
Resolves: #238