Linux: use "set -e" in Debian package maintainer scripts

See http://www.debian.org/doc/debian-policy/ch-maintainerscripts.html
for reference:

"The package management system looks at the exit status from these scripts.
It is important that they exit with a non-zero status if there is an error,
so that the package management system can stop its processing. For shell
scripts this means that you almost always need to use set -e (this is usually
true when writing shell scripts, in fact). It is also important, of course,
that they exit with a zero status if everything went well."

BUG=none
R=mmoss@chromium.org

Review URL: https://codereview.chromium.org/25383002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226257 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226257
Don't embed manifest for unit_tests so that incremental linking works

Losing incremental linking makes the link go from ~5-10s for a one file
change to 5m30s.

R=tommycli@chromium.org
BUG=276953

Review URL: https://codereview.chromium.org/25258003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226258 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226258