These projects were tested and it was found that their use
of MSAN does not work on Ubuntu 20.04. Therefore their use of
MSAN is being disabled.
Related: #6180
* protobuf-c: fix coverage builds, ignore protobuf results
No need to include Google Protobuf library coverage results, since we
are testing protobuf-c.
* protobuf-c: use pkg-config for dependency resolution
* protobuf-c: use next branch to check latest code
master is not the latest branch in the protobuf-c repo. Run fuzzer on
the next branch, which is the development branch for the next release.
* protobuf-c: add myself to CC list
jonathanmetzman