rsyslogd broken because libc0.3 is missing pthread_setcancelstate

[Esa Peuha <esa.peuha@gmail.com>]

The recent update of libc0.3 to version 2.23-1 made rsyslogd from
rsyslog 8.16.0-1+b4 unable to start:

  could not load module '/usr/lib/rsyslog/lmnet.so', dlopen:
  /usr/lib/rsyslog/lmnet.so: symbol pthread_setcancelstate, version
  GLIBC_2.21 not defined in file libc.so.0.3 with link time reference

I don't know which package should be fixed, but clearly one of them
needs to be.