Remove C++11 language elements

see
  ad484e4c
and
  840d975a
3 jobs for 0.92.x in 10 minutes and 5 seconds
Status Job ID Name Coverage
  Build
passed #103548679
inkscape:linux

00:10:05

passed #103548680
translations

00:05:41

 
  External
passed continuous-integration/appveyor/branch