Bug#887781: libffado FTBFS with glibc 2.26

[Adrian Bunk]

Source: libffado
Version: 2.3.0-5
Severity: serious

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/libffado.html

...
src/libutil/PosixMessageQueue.cpp: In member function 'virtual bool Util::PosixMessageQueue::enableNotification()':
src/libutil/PosixMessageQueue.cpp:444:24: error: 'SIGEV_THREAD' was not declared in this scope
     evp.sigev_notify = SIGEV_THREAD;
                        ^~~~~~~~~~~~