Bug#986153: add support not to build udeb / don't use link optimization

[Matthias Klose]

Package: src:cairo
Version: 1.16.0-5
Tags: patch

while the package doesn't create udeb's with the noudeb profile, it still builds
a separate tree.

trying to enable link time optimization results into a failing test.  Both
Fedora and Opensuse kept lto enabled for cairo, but also ignoring test failures
during the build.  The line optimize=-lto currently doesn't have any affect for
Debian, afaics.  I didn't investigate the test failure itself.

test and build log at
https://launchpad.net/ubuntu/+archive/test-rebuild-20210325-hirsute/+build/21214109

patch at
http://launchpadlibrarian.net/530874655/cairo_1.16.0-5build1_1.16.0-5ubuntu1.diff.gz