Using a path with a space to execute soong is unlikely, but it
might as well work. Quote all the paths in the soong scripts.
Soong and blueprint will still both fail if the relative path between
the soong script and the source directory has a space in it, but this
is even more unlikely.
Change-Id: I8986f10115209d69b09b82ffea26e4b10d29c197
bootstrap.bash creates a soong script in the output directory using
build/soong/soong.in. This requires a manual rebootstrap any time
soong.in changes. Instead, have bootstrap.bash symlink
build/soong/soong.bash to soong in the output directory, and create
a file called .soong.bootstrap in the output directory that contains
the variables that bootstrap.bash sets.
Change-Id: I5e6e54c2e8bdde876941e2e082f9ba177c757cbf
